Hundreds of Geoglyphs Discovered in the Amazon

Introduction - Introdução

This web page was created over the past decade, with additions blogged chronologically down page. First, here follows the current update after links to the most recent data file versions:


2021.12.30 - Currently, I have placemarked and databased more than 1,100 ancient Amazonian earthworks, with over 1,050 geoglyphs and zanjas plus over 50 mound villages documented in both the Excel file and the KML placemarks file linked above. Almost all earthworks are outlined, along with highlighting of 1,000 lines, visible ancient roads and embankments. I've also added, to improve viewing the outlines and lines and to facilitate creating graphics, background overlay images with three color options, black, blueprint, and jungle green.

Boca do Acre geoglyphs

This first major update after nearly three years more than doubles the number of sites since then. In the past three years Google Earth satellite imagery updated in many areas and I began using other satellite image providers, especially for those areas still having poor resolution in Google Earth. I patiently waited ten years and relented to doing the extra work involved. Viewing more satellite images augments and upgrades the data, justifying the effort. I updated numerous coordinates, outlines, and lines, and added graphics, more research results, and academically published site names.

Some of the geoglyph placemark balloons now feature quotations with links to their sources, thus geolocating selected information. Below in this page the references table is updated and the table is also in a folder in the KML file.

2022.04.26 - Since the Dec. 30 update, I've researched local naming of sites and aerial photography. Several geoglyphs not easily spotted in satellite images were revealed. More geoglyphs are placemarked and outlined and more geoglyph placemark balloons feature referenced information and published locality names. Herein and in pertinent placemark balloons I've added more information about the history of discovery of the geoglyphs, a few more references, plus links to selected aerial photography. Both the KML and XLS files are updated.

Amazonas geoglyphs, aerial image with outlines of earthworks.

Hundreds of Geoglifos Discovered in the Amazon

2010.01.20 - Geoglifos is the term applied in Brazil to geometric earthworks discovered after recent deforestation. Geoglyphs are not new in South American archaeology, but these are different—massive earthworks of tropical forest soil rather than desert surface alterations. The Amazon Geoglifos present geometric forms; circles, squares, ellipses, octagons, and more, with individual forms up to several hundred meters across. Some are connected by parallel walls. Their distribution spans hundreds of kilometers, and much of the area remains forested jungle. Some resemble geometric earthworks in the Ohio Valley.

Rio Branco geoglifo circular
Click images to view larger aerial imagery.

Geoglifos have been discovered in Google Earth by exploring areas with recent high-resolution imagery updates. (Click thumbnail images herein to view larger image files in a new window.) Recent Brazilian news videos on the ground and from small planes, embedded below, clearly illustrate the impressive scale, the massive amount of earth moved, and the unique monumental quality of this ancient cultural expression.

Earthworks preservationists, researchers, and recent archaeology news feeds called my attention to these constructs enough times to finally prompt online research. I was surprised by their numbers and scale. I quickly noticed many newly-discovered earthworks are already damaged. There seems to be no respect of or protection for the unique archaeological remains. Have efforts been made to preserve them? Do the forms go unnoticed on the ground in the jungle because of their large scale? The ancient human landscape has come to the attention of UNESCO, good news for conservationists while jungle deforestation marches apace. Apparently, archaeology survey needs to precede road building and vegetation clearing in this region, not follow on the deforestation.

Perhaps greater recognition of the signficance and scope of the Amazon Geoglifos discovery will protect them. With that goal in mind, here follows a collection of the current YouTube videos, placemark links, more images from Google Earth, readings, and online resource links:

O Mistério dos Geoglifos

May 25, 2013 - Quem desenhou sulcos tão profundos no solo amazônico,
e de forma tão precisa? Por que? Quando? E com que intenção?

Na Trilha dos Geoglifos

Oct 26, 2013 - Documentário de Marisa Dwir, sobre as grandes marcas no solo do
Estado do Acre. Esse documentário fala sobre a descoberta dos Geoglifos, as pesquisa
que estão sendo realizadas, quais as áreas de pesquisas e como estão sendo feitas.


amazon geoglyphGoogle Earth Placemarks
2011.01: amazon_geoglifos.kmz
2011.04 update:

I'm posting a placemark file of the geoglyphs I could find. Recently local archaeologists thought, given the known distribution and the amount of the area deforested so far, only ten percent of the geoglifos were known. Some are visible in YouTube videos that are not yet seen on Google Earth. Hundreds exist and more will be visible and discovered as new areas of Google Earth update with hi-res images.

2014.02.02 - Updated Google Earth placemarks file with 240 geoglyphs, plus many ground lines. The new discoveries extend the area of geoglifos east, west, and south, including just across the border in Bolivia. Download brazil_geoglifos.kml. I seek additional placemarks and data files. Please GPS monuments you visit.

Schaan, 2010 - Arqueologia da Amazônia Ocidental: Os Geoglifos do Acre
PDF - Ninety excellent aerial photographs.

Denise Schaan - Paisagens da Amazônia Ocidental
Nossa capacidade de localizar os geoglifos aumentou significativamente quando Alceu Ranzi, Roberto Feres e Foster Brown descobriram que poderiam utilizar o Google Earth, disponível gratuitamente na internet, como recurso de prospecção remota. Desta maneira, empreendendo varreduras sistemáticas nas imagens de satélite, foi possível multiplicar rapidamente o número de estruturas conhecidas. Em 2005 conhecia-se 32, em 2007 esse número já era de 150 e em 2010 já temos cerca de 270 estruturas registradas, mas nem todas ainda visitadas e nomeadas. A partir de 2007, com o apoio do Governo do Estado do Acre obtivemos acesso a imagens de outro satélite, o Formosat, que possui cobertura melhor do que o Google e que possibilitou abarcar todas as áreas sem vegetação. Através das imagens de satélite, localizamos geoglifos também no sul do Amazonas, na Bolívia, e em Rondônia.

Our ability to locate geoglyphs increased significantly when Alceu Ranzi, Roberto Feres and Foster Brown discovered that they could use Google Earth, available for free on the internet, as a remote prospecting resource. In this way, undertaking systematic scans of satellite images, it was possible to quickly multiply the number of known structures. In 2005, 32 were known, in 2007 this number was already 150 and in 2010 we already have about 270 registered structures, but not all of them have yet been visited and named. Starting in 2007, with the support of the Government of the State of Acre, we obtained access to images from another satellite, Formosat, which has better coverage than Google and which made it possible to cover all areas without vegetation. Through satellite images, we also located geoglyphs in the south of Amazonas, in Bolivia, and in Rondônia.

Alceu Ranzi - Geoglifos: a descoberta e o potencial turístico
... tive a oportunidade de participar, em 1977, no Acre, da primeira etapa do Projeto PRONAPABA (Programa Nacional de Pesquisas Arqueológicas na Bacia Amazônica), sob a coordenação do Dr. Ondemar Dias e a participação do arqueólogo Franklin Levy. Logo no segundo dia .... foi localizada a primeira estrutura geométrica construída em forma de círculo, com vala e mureta. A visão ao nível do solo foi parcial, embora esteja marcada na memória de toda a equipe. Mas em 1986, quando tive a chance de ver uma estrutura dessas do alto, aí sim fiquei impactado. Foi durante um vôo comercial entre Porto Velho e Rio Branco. A partir daí, busquei apoio junto ao Gabinete Civil do Governo do Acre. Conseguimos um avião para sobrevôo, graças aos préstimos do Prof. Geraldo Gonçalo da Costa. Participaram do sobrevôo os paleontólgogos Dr. Jonas Pereira de Souza Filho e Dr. Carl Frailey, o biólogo José Carlos Rodrigues dos Santos e o fotógrafo Agenor Mariano. As fotos desse sobrevôo pioneiro foram publicadas na edição do dia 15 de agosto de 1986, do Jornal O Rio Branco, na época o único jornal da capital acreana e retratavam um sítio-monumento, de formato semicircular duplo, posteriormente registrado como Seu Chiquinho.

... I had the opportunity to participate, in 1977, in Acre, in the first stage of the PRONAPABA Project (National Program for Archeological Research in the Amazon Basin), under the coordination of Dr. Ondemar Dias and the participation of archaeologist Franklin Levy. On the second day..., the first geometric structure built in the shape of a circle, with a ditch and a wall, was located. The view at ground level was partial, although it is etched in the memory of the entire team. But in 1986, when I had the chance to see such a structure from above, I was really impressed. It was during a commercial flight between Porto Velho and Rio Branco. From there, I sought support from the Civil Cabinet of the Government of Acre. We got a plane to fly over, thanks to Prof. Geraldo Goncalo da Costa. Paleontologists Dr. Jonas Pereira de Souza Filho and Dr. Carl Frailey, biologist José Carlos Rodrigues dos Santos and photographer Agenor Mariano. The photos of this pioneering flyby were published in the August 15, 1986 edition of Jornal O Rio Branco, at the time the only newspaper in the Acre capital, and portrayed a monument-site, with a double semicircular format, later registered as Seu Chiquinho.

Rio Branco geoglifos, Acre, Brazil, vista aerea.

Acre geoglyphs aerial image

Geoglyph News - Geoglifo Notícias

2020.08.08 - - Sítios arqueológicos são aterrados em fazenda de presidente da Federação da Agricultura do Acre The Instituto do Patrimônio Histórico e Artístico Nacional called the Federal Public Ministry and the Federal Justice after discovering that archaeological sites, where three geoglyphs are located, at Fazenda Crixa II, in the city of Capixaba, in the interior of Acre, were leveled during the process grain planting. Geoglyphs are protected by federal law.

2019.10.31 - Recent academic publication now online, plus article links:

A la sombra de los Andes. Arquitectura monumental en los Llanos de Mojos 2018 Carla Jaimes Betancourt and Heiko Prümers

Why Some Amazonian Societies Survived and Others Perished amid Pre-Columbian Droughts, Debbie Ponchner, Scientific American

Ancient Amazonian societies managed the forest intensively but sustainably—here’s what we can learn from them

2018.11.12 - Globo has an excellent video with their news report With a unanimous decision, geoglifo in Rio Branco is the first to be registered by IPHAN on the UNESCO World Heritage Tentative List. IPHAN's president Kátia Bogéa pointed out "It is something extremely relevant and important about the trajectory of human beings on Earth...."

Rio Branco - 09/11/2018. Com decisão unânime, geoglifo em Rio Branco é o primeiro a ser tombado pelo Iphan.Os 22 membros do Conselho Consultivo votaram a favor do tombamento. Sítio Arqueológico Jacó Sá possui dois geoglifos e fica a 50 quilômetros de Rio Branco. ......

2018.03.27 - An excellent Nature article published online today, Pre-Columbian earth-builders settled along the entire southern rim of the Amazon, reports on a little studied section of the Southern Rim of the Amazon (SRA):

"... the discovery of Pre-Columbian ditched enclosures in the Tapajós headwaters. The results show that an 1800 km stretch of southern Amazonia was occupied by earth-building cultures...."

"The possible geographical continuity of late Pre-Columbian earth building cultures across all southern Amazonia has been envisaged for nearly a decade; however, archaeological evidence of such long-range connections remained elusive. The results of our survey in the Tapajós headwaters confirm that ditched enclosures are found over an 1800 km east–west belt along the SRA. The expansion in earthwork construction and the peak of occupation at most sites—both in the eastern and western extremes of the SRA—occurred between Cal AD 1250 and 1500. During this time, the whole SRA was settled by dense populations...." (emphasis added)

2015.02.16 - A BBC article Brazil Amazon: Drone to scan for ancient Amazonia reports a $1.9 million grant from the European Research Council to laser scan for Amazon geoglyphs. This is great news for geoglyph research and hopefully for preservation of some grand, historically-unaltered earthworks and their ecology:

... A drone will be sent up with a laser instrument to peer through the canopy for earthworks...

This vehicle's lidar instrument should reveal how many more geoglyphs remain hidden beneath still-canopied regions of Amazonia. ...

No-one is really quite sure what these earthen circles, squares and lines represent. ... "It’s a hot debate right now in New World archaeology," said Dr Jose Iriarte...

Drone varrerá Amazônia em busca de civilizações antigas Jonathan Amos, Correspondente de Ciência da BBC News, de San Jose, 16 fevereiro 2015

... Dependendo dos dados obtidos, eles também podem ser usados para a elaboração de políticas de uso sustentável da floresta.

Mas a questão mais importante é tentar compreender a escala e as atividades das populações que viveram na Amazônia no final do período antes da chegada dos europeus à América, ou seja, os últimos 3 mil anos antes de 1490....

2015.02.23 - Another major article today, Drones to scan for evidence of ancient civilizations in Amazonia.

Among other objectives, (Dr. José) Iriarte hopes to test this idea of large, complex and hierarchical societies in the Amazon, known as the “cultural parkland hypothesis’, by conducting an intensive study of four distinct regions across the Amazon, implementing a battery of state-of-the-art techniques from the social and natural sciences, including archaeology, archaeobotany, ethnohistory, and paleoecology, in conjunction with remote sensing technology. ...

Videos and Graphics - Vídeos e Imagens

One of the largest works visible in Google Earth is the Aeropuerto site near Rio Branco, Acre, Brazil.
rio branco geoglyph
Click image for larger version
. Images below link to large files with updated, high resolution imagery.

Geoglifos Amazônicos

Sept. 2008 - Documentario Exibido no Fantastico, sobre Geoglifos

Geoglifos em Acrelândia

April 2008

amazon geoglyph amazon geoglyph


Sept. 2006, Equipe da TBS e o palentólogo Alceu Ranzi
percorrem trecho de um geoglifo da Amazônia.

Geoglyph Readings - Geoglifo Leituras

National Geo 2010: "Lost" Amazon Complex Found; Shapes Seen by Satellite

The so-called 'crop circles' of Santa Teresinha are seen in a great photograph. "Satellite images ... have revealed more than 200 geometric earthworks spanning a distance greater than 155 miles (250 kilometers) ... uplands sites appear to have been home to as many as 60,000 people."

Historia: National Geographic 2017 - Photo Gallery - La deforestación amazónica deja al descubierto los antiguos geoglifos de los indígenas
... La deforestación moderna ha permitido descubrir más de 450 geoglifos amazónicos, que ocupan una superficie de unos 13.000 km2, en el estado de Acre ....

"It's an ill wind that blows nobody any good. The combination of land cleared of its rainforest for grazing and satellite survey have revealed a sophisticated pre-Columbian monument-building society in the upper Amazon Basin on the east side of the Andes. This hitherto unknown people constructed earthworks of precise geometric plan connected by straight orthogonal roads. Introducing us to this new civilisation, the authors show that the 'geoglyph culture' stretches over a region more than 250km across, and exploits both the floodplains and the uplands. They also suggest that we have so far seen no more than a tenth of it."
Pre-Columbian geometric earthworks in the upper Purús: a complex society in western Amazonia Martti Pärssinen, Denise Schaan and Alceu Ranzi, 2009 Antiquity 83(322):1084-1095.

"GEOGLIFOS O que são? Geoglifos são vestígios arqueológicos representados por desenhos geométricos (linhas, quadrados, círculos, octógonos, hexágonos etc...), zoomorfos (animais) ou antropomorfos (formas humanas), de grandes dimensões e elaborados sobre o solo, que podem ser totalmente e melhor observados se vistos do alto, em especial, através de sobrevôo."   |   links page 

Internet Software Programs Aid in Search for Amazonian Geoglyphs, Alceu Ranzi, Roberto Feres, Foster Brown EOS Vol. 88, No. 21, 22 May 2007. - The Web-based Google Earth software program recently has incorporated high-resolution satellite imagery that facilitates the search for landscape expressions of past civilizations that we call geoglyphs. Since 2000, about 40 such geoglyphs have been observed in overflights above recently deforested pastures of southwestern Amazonia in eastern Acre State, Brazil. These geoglyphs typically are circular or rectangular, on the scale of 100 meters or more, with bordering trenches 1-3 meters deep (Figure 1). Carbon-14 dating of charcoal associated with these geoglyphs indicates ages between 2500 and 1000 years B.P.

"Until the past year, high-resolution Ikonos and QuickBird imagery was too expensive for local researchers to use in surveys for geoglyphs. The incorporation of such imagery by Google Earth for extensive stretches in Amazonia has permitted researchers to search for geoglyphs in eastern Acre. Figure 2 shows how preliminary data analysis can be done with high-resolution satellite imagery to determine the areal density and distribution of geoglyphs. In this transect, 39 potential geoglyphs were observed in an examination of the imagery. Through fieldwork and overflights during the past three decades, only nine geoglyphs had been discovered in the area of the transect."

Written on the land Amazonian Geoglyphs number in the thousands and are truly spectacular, let's look at the sources ... "Ring ditch sites in Acre and the Bolivian Amazon, described as geoglyphs because of their impressive patterns (circular, oval, octagon, square, rectangle, and D-shapes), appear to be more ceremonial than residential or defensive." (Martti Parssinen, Denise Schaan & Alceu Ranzi Pre-Columbian geometric earthworks in the upper Purus: a complex society in western Amazonia)

"Ring ditch sites are reported in the Bolivian Amazon (Figure 11.5), Matto Grosso, Acre, and Upper Xingu River regions (Erickson 2002; Heckenberger 2005; Parssinen et al. 2003; Ranzi and Aguiar 2004). These sites consist of a closed or U-shaped ditched enclosure or multiple ditches. Heckenberger (2005) describes numerous sites with large open plazas and radial roads marked by earthen berms extending through residential sectors enclosed by deep semi-circular moat-like ditches and embankments." ...
"Historical ecologists respond that ignoring the complex human history of environments in Amazonia would be unwise. A vast indigenous knowledge spanning hundreds of generations about the creation, transformation, and management of environments is physically embedded in the landscape, encoded in the distribution and availability of plant and animal species, documented in historical and ethnographic accounts, and in some cases, still practiced by native Amazonians."Amazonia: The Historical Ecology of a Domesticated Landscape

geoglifos do acrelandia

Reflections - Reflexões

An unusual moment presents itself in the Amazon. Unlike regions where we regret past destruction, this is a region where impending destruction can still be prevented. Will the current physical destruction to the earthworks stop or continue as roads intrude in the jungle and deforestation advances? Will ethnobotanists examine the botanical flora of the clearly-demarcated ancient sites before deforestation? Will any of the still-forested sites be preserved as they are today?

Acre, brazil, square earthworks

Aerial Photography Updates - Fotografia Aérea Atualizaçãos

2014.01.28 - Twenty new images of updated Google Earth aerial photography have been added to or linked from this page. Some older images now link to larger, updated imagery. Some of the largest geoglyphs are not yet seen in Google Earth, so check future updates.

In Google Earth, many geoglyph images updated since 2011, revealing new geoglyphs and providing higher resolution imagery of known geoglyphs. Detailed aerial photographs show how recent the deforestation of some of the earthworks is. They also reveal how fence lines add unwanted new erosion lines to the otherwise still pristine earthworks. Individual trees and even palm fronds are visible in the best resolution updates today, enabling better documentation and oversight of their conservation or destruction.

Rio Branco geoglyphs

Some newly discovered in Google Earth geoglyphs have been surprising. Geoglifos are now visible much further to both the west in Acre and east in Rondonia. One is seen in Bolivia, making them an international phenomena. A great variety of geometry is presented. Several of the large monuments are grouped. One of the largest of the earthworks, the Bella Flor Geoglyph, measures 380 meters on one axis, surpassing the previous largest. The new database file presents their dimensions and categorizes the geometry.

2014.10.08 - Fifty-six new Amazon geoglyphs have been noted where Google Earth images were recently updated, including an area near Boa Vista, Amazonas rich in monuments and lines (image below). To get a better idea of the pattern the images create on the earth, I used the line tool to outline the visible earthworks. New geoglyphs placemarks file:, updates to the Excel and KML files with this data to follow.

2014.11.16 - Another Google Earth imagery update in Rondonia enabled survey of more geoglyphs. New placemarks, outlines, and lines are added to the most recent files linked above. Coordinates have been updated to uniformly reflect current imagery placements. Some site names and variables in the dataset have been edited. Currently, over 300 geoglyphs are placemarked.

Google Earth Community will be adding these placemarks online with the next update. If you see two of each placemark after opening the placemark file, you can hide the online ones by turning off Layers > Gallery > Google Earth Community in your virtual browser.

Google Earth's Historical Imagery tool is quite useful in surveying the sites. The slider facilitates switching between all the different aerial images that have been posted for every location. In some cases, older views are not deforested or overgrown and uniformly green. Other images may reveal the earthworks clearly because the pastures are closely grazed during the dry season when vegetation colors vary. Switching between images also reveals how much placement has changed as newer images were added, illustrating why some coordinates have been updated.

Historical imagery also reveals earthwork destruction. I noticed bulldozing obliterating earthwork acrc16 (-10.0968 -67.6587) just before Sept. 2009, for the convenience of planting it seems. Plowing is impacting others. Bulldozing is used in deforestation, so many earthworks may disappear before images of them are even captured. As is typical of the "advance" of "civilization," we know not what we destroy and the destruction impedes ever knowing. Pages are being torn from the book of history written upon the earth. The earthworks are protected by laws, which apparently are either ignored or not enforced.

The virtual resources to appreciate this incredible cultural manifestation aid in preservartion efforts. As more and more geoglyphs become clearly visible in Google Earth, the immense and impressive scope of the Amazon geoglyphs becomes more apparent. We have a long way to go to understand what we are discovering. Hopefully, the Amazon geoglyphs will be one manifestation of the past that survives the present, or we may never know.

2016.02.16 - With all 2015 and 2016 surveys to date and data consolidation, the data files now include 440 geoglyphs. Excel and Google Earth files are updated, and archaeogeodesy.xls has all 2015 data.

After discovering the first geoglyph in Peru and several more in Bolivia, I renamed the files Amazon Geoglyphs. Included for comparison are several large geoglyphs in Beni, Bolivia. Also, compare the Kazakhstan geoglyphs.

Here are the latest data file versions:


Clark L. Erickson 2015: Pre-Columbian Monumental Landscapes in the Bolivian Amazon

Space Archaeology in the Amazon, Beni, Bolivia

2017.02.07 - After catching up the Amazon Geoglyphs survey, I turned to the adjacent area to the south in Bolivia. Several areas with newly updated hi-res imagery in Google Earth had dense prehistoric occupation with earth moving cultural expressions. This Amazonian region, a vast, seasonally flooded savannah known as Llanos de Mojos, is particularly rich in archaeology. Elaborate causeway and canal networks and extensive raised agricultural fields are visible along with geometric earthworks and mounds. Survey results are placemarked in a new Google Earth KML file:

Space Archaeology in the Amazon, Beni, Bolivia
Google Earth KML Document - 734 KB -

Space archaeology has become easier over the last decade as more high resolution imagery is published. I can't keep up, but I'll keep trying. Already, more areas in Bolivia are updated and many more earthworks are visible, so I'll update this file later. Check the ArchaeoBlog for the latest news. Meanwhile, in the bolivia.kml zero in on the immense zanjas in southeast Mojos and their lunar major alignment.


2019.01.31 - Currently, more than 500 geoglyphs are documented in both an Excel spreadsheet and Google Earth placemark files. The geoglyphs are placemarked, all except the smallest earthworks are outlined, plus visible ancient lines are highlighted.


References and readings in table below updated 2021.12.

Articles by prominent researchers working in the geoglyphs region. The linked articles provide further references. Some articles are quoted and cited in the placemarks to geolocate relevant information.

Alceu Ranzi - Arqueologia da Amazônia Ocidental, Os geoglifos do Acre

Alceu Ranzi e Martti Pärssinen 2021 - Os Geoglifos e a Civilização Aquiry

Arnold and Prettol 1988 - Field Reports: Aboriginal Earthworks near the Mouth of the Beni, Bolivia

Clark L. Erickson 2000 - An Artificial Landscape-Scale Fishery in the Bolivian Amazon

Clark L. Erickson 2010 - The Transformation of Environment Into Landscape: The Historical Ecology of Monumental Earthwork Construction in the Bolivian Amazon

Clark L. Erickson 2011 - Agency, Causeways, Canals, and the Landscapes of Everyday Life in the Bolivian Amazon

Clark L. Erickson 2018 - Diversity of Pre-colonial Earthworks in the Brazilian State of Acre, Southwestern Amazonia

Denevan, William M. 1966 - The Aboriginal Cultural Geography of the Llanos de Mojos of Bolivia. In Ibero-Americana 48. Berkeley: University of California Press.

Denevan, William M. 1992 - The Pristine Myth: The Landscape of the Americas in 1492 in Annals of the Association of American Geographers 82(3): 369-385.

Denevan, William M. 2001 - Cultivated Landscapes of Native Amazonia and the Andes. Oxford University Press.

Diez Castillo 2017 - Preliminary results of the 2017 season in the Amazonian earthen structures known as geoglyphs

Erickson and Walker 2009 - Precolumbian Causeways and Canals as Landesque Capital

Erickson, 2008 - Zanjas Circundantes: Obras de Tierra Monumentales de Baures en la Amazonia Bolivia

Gregorio de Souza 2018 - Pre-Columbian earth-builders settled along the entire southern rim of the Amazon

Heiko Prümers 2013 - Volver a los sitios – el Proyecto Boliviano-Alemán en Mojos

Heiko Prümers 2014 - Sitios prehispánicos con zanjas en Bella Vista, Provincia Iténez, Bolivia

Iriarte 2020 - Geometry by Design: Contribution of Lidar to the Understanding of Settlement Patterns of the Mound Villages in SW Amazonia

Iriarte 2021 - Refining the Chronology and Occupation Dynamics of the Mound Villages of South-Eastern Acre, Brazil

John Francis Carson 2014 - Pre-Columbian land use and human impact in the Bolivian Amazon

John H. Walker 2008 - Pre-Columbian Ring Ditches along the Yacuma and Rapulo Rivers, Beni, Bolivia: A Preliminary Review

Parssinen 2021 - Tequinho Geoglyph Site and Early Polychrome Horizon BC 500/300 - AD 300/500 in the Brazilian State of Acre

Parssinen 2015 - Pre-Columbian Geometric Earthworks in the Upper Purús: A Complex Society in Western Amazonia

Parssinen 2015 - The geoglyph sites of Acre, Brazil: 10 000-year-old land-use practices and climate change in Amazonia

Prümers and Betancourt 2014 - 100 años de investigación arqueológica en los Llanos de Mojos

Roberto Langstroth 1996 - Forest Islands in an Amazonian Savanna of Northeastern Bolivia

Sanna Saunaluoma 2010 - Pre-Columbian earthworks in the Riberalta region of the Bolivian Amazon

Sanna Saunaluoma 2012 - Monumentality in Western Amazonian formative societies: geometric ditched enclosures in the Brazilian state of Acre

Saunaluoma and Parssinen 2015 - Subsistence practices among earthwork builders: Phytolith evidence from archaeological sites in the southwest Amazonian interfluves

Saunaluoma and Schaan 2012 - Monumentality in Western Amazonian formative societies: geometric ditched enclosures in the Brazilian state of Acre

Saunaluoma 2018 - Diversity of Pre-colonial Earthworks in the Brazilian State of Acre, Southwestern Amazonia

Saunaluoma et.el. 2019 - UAV survey at archaeological earthwork sites in the Brazilian state of Acre, southwestern Amazonia

Saunaluoma et.el. 2020 - Patterned Villagescapes and Road Networks in Ancient Southwestern Amazonia

Schaan, 2007 - Geoglifos da Amazônia Ocidental: Evidência de Complexidade Social entre Povos da Terra Firme

Schaan, 2010 - Geoglifos: paisagens da Amazônia Ocidental

Schaan, 2012 - New radiometric dates for precolumbian (2000–700 B.P.) earthworks in western Amazonia, Brazil

Umberto Lombardo 2010 - Raised Fields in the Bolivian Amazonia: a prehistoric green revolution or a Floodrisk mitigation strategy?

Umberto Lombardo 2010 - Pre-Columbian human occupation patterns in the eastern plains of the Llanos de Moxos, Bolivian Amazonia

Umberto Lombardo 2010 - Raised Fields of Northwestern Bolivia: a GIS based analysis

Umberto Lombardo 2011 - Eco-archaeological regions in the Bolivian Amazon: Linking pre-Columbian earthworks and environmental diversity

Umberto Lombardo 2013 - Early and Middle Holocene Hunter-Gatherer Occupations in Western Amazonia: The Hidden Shell Middens

Umberto Lombardo 2014 - Soil properties and pre-Columbian settlement patterns in the Monumental Mounds Region of the Llanos de Moxos, Bolivian Amazon

Umberto Lombardo 2014 - Neotectonics, flooding patterns and landscape evolution in southern Amazonia

Virtanen & Saunaluoma 2017 - Visualization and Movement as Configurations of Human–Nonhuman Engagements: Precolonial Geometric Earthwork Landscapes of the Upper Purus, Brazil

Walker, John H. 2008 - Llanos de Mojos in William Isbell and Helaine Silverman, eds., South American Archaeology. New York: Kluwer, 927-940.

Watling 2017 - Impact of pre-Columbian “geoglyph” builders on Amazonian forests

Penn Museum video 2014 - Great Wonders: The Monumental Geoglyphs of Amazonia

Brown University video 2015 - Pre-Columbian Monumental Landscapes in the Bolivian Amazon

University of Chicago video 2012 - Culture amidst the Pristine: The Anthropogenic Forests of the Bolivian Amazon

Boa Vista, Amazonas, Brazil. View a larger version. Download a 2560 pixel deskpicture.

More Readings - Mais Leituras

You can visually explore the earthworks, the deforestation, and expanses of forested jungle on the virtual globe. Visit and Google Earth Community for more information about Google Earth. I will add content below as news, publications, and good photography links develop.

Ondemar F. Dias Jr. and Eliana T. Carvalho 1978 As Estruturas de Terra na Arqueologia do Acre Boletim do Instituto de Arqueologia Brasileira

"... Em 1976 teve início o Programa Nacional de Pesquisas Arqueológicas na Bacia Amazônica ... Logo no primeiro sítio localizado por nós em 1977, próximo à cidade de Rio Branco, pudemos constatar a existência de uma estrutura circular em forma de valeta pouco profunda, com um pequeno acúmulo de terra em forma de mureta na área externa do círculo ... elas representam um interessante e excitante vestígio das antigas populações indígenas que habitaram aquela parte da Amazônia."

Ciência anuncia 250 geoglifos descobertos no Acre (old link) - 25 de julho de 2009 - Os pesquisadores Alceu Ranzi e Denise Schaan anunciaram nesta sexta-feira, 24, a identificação de vinte novos geoglifos no Vale do Acre, elevando para 250 o número de estrutura catalogadas ... "Teremos novas escavações em 2010", informou Schaan ... o grupo de pesquisa ... "Geoglifos da Amazônia Ocidental" vem desenvolvendo desde 2005 pesquisas intensivas sobre os geoglifos no Estado, com o objetivo de fazer um amplo levantamento dos geoglifos na parte Leste do Acre. Os geoglifos fazem parte de uma lista do Instituto Nacional de Patrimônio Histórico e Artístico Nacional (Iphan) para recomendar à Organização das Nações Unidas para a Educação, Ciência e Cultura (Unesco) ...

Arqueologia: novas descobertas elevam para 255 os geoglifos do Acre (old link) - julho 27, 2009 - ... um grupo de pesquisadores já identificou e catalogou a existência de 255 geoglifos na parte leste do Acre ... Os geoglifos são figuras formadas por valetas com largura média de 11 metros, tendo cada valeta de 1 a 4 metros de profundidade. A técnica construtiva inclui muretas de 6 a 8 metros com meio metro de altura. As figuram chegam a medir em média de 100 a 200 metros. Eles possuem, ainda, caminhos com 20 metros de largura ...

Abril 10, 2009 (old link) . Geoglifos do Acre podem ser reconhecidos pela Unesco como Patrimônio da Humanidade no Brasil. "Os geoglifos do Acre foram incluídos pelo Instituto do Patrimônio Histórico e Artístico Nacional (IPHAN) numa lista indicativa de bens passíveis de ser declarados pela Unesco como Patrimônio da Humanidade no Brasil."

There is no substitute for great aerial photography to appreciate the monumentality and massive efforts involved in creating the geoglyphs. Check out this 2017 National Geographic article:
La deforestación amazónica deja al descubierto los antiguos geoglifos de los indígenas

Amazon explorers uncover signs of a real El Dorado by Rory Carroll, "It is the legend that drew legions of explorers and adventurers to their deaths: an ancient empire of citadels and treasure hidden deep in the Amazon jungle." ... "... only now, as satellite imagery and felling reveal sites ... the scale of the settlements is becoming clear. Some anthropologists say the feat, requiring sophisticated engineering, canals and roads, rivals Egypt's pyramids." - criado pelo paleontólogo Alceu Ranzi - fotos e informações podem ser obtidas - Geoglifos do Acre. More information and photos on the Geoglyphs of Acre site. Hay mas informacion y fotos en el sitio Geoglifos de Acre. Fotos/photos.

Lombardo, Umberto and Heiko Prümers 2010 - Pre-Columbian human occupation patterns in the eastern plains of the Llanos de Moxos, Bolivian Amazonia, Journal of Archaeological Science 37:1875-1885.

"While researchers piece together the Amazon’s ecological history, mystery still shrouds the origins of the geoglyphs and the people who made them. So far, 290 such earthworks have been found in Acre, along with about 70 others in Bolivia and 30 in the Brazilian states of Amazonas and Rondônia ... Denise Schaan, an archaeologist at the Federal University of Pará in Brazil who now leads research on the geoglyphs, said radiocarbon testing indicated that they were built 1,000 to 2,000 years ago, and might have been rebuilt several times during that period... For Brazil’s scientists and researchers, Ms. Schaan said, the earthworks are “one of the most important discoveries of our time.” But the repopulation of this part of the Amazon threatens the survival of the geoglyphs, after being hidden for centuries. " NY Times Jan. 14, 2012

"The forested western Amazon was once thought barren of complex human culture. But researchers are now uncovering enigmatic earthworks left by large, organized societies that once lived and farmed here." Ancient Earthmovers Of the Amazon C. C. Mann 2008.

"The unexpected discovery of immense geometrically patterned earthworks called "geogphyhs" among the terra firme rainforests of western Amazonia is radically changing our notion of past human societies in this region of the Amazon.  Over 300 of these spectacular geometric earthworks have been found across eastern Acre state, Brazil." The Geoglyphs site has a photo gallery.

Sacred Geographies of Ancient Amazonia: Historical Ecology of Social Complexity
Denise P Schaan 2011. The legendary El Dorado—the city of gold—remains a mere legend, but astonishing new discoveries are revealing a major civilization in ancient Amazonia that was more complex than anyone previously dreamed. Scholars have long insisted that the Amazonian ecosystem placed severe limits on the size and complexity of its ancient cultures, but leading researcher Denise Schaan reverses that view, synthesizing exciting new evidence of large-scale land and resource management to tell a new history of indigenous Amazonia. Schaan also engages fundamental debates about the development of social complexity and the importance of ancient Amazonia from a global perspective. This innovative, interdisciplinary book is a major contribution to the study of human-environment relations, social complexity, and past and present indigenous societies.

Professora Denise Schaan fala sobre os geoglifos da Amazônia
Portuguese radio:

"... you found many we still didn´t have. We have identified 410 geogliphs in Acre alone." Denise Schaan (e-mail) 2014.02.

Good aerial photography with place names: Tecnologia faz descoberta de geoglifos na Amazônia saltar 1.000% em 11 anos 13/10/2012. Em junho deste ano, pesquisadores identificaram 18 novas formas geométricas no Amazonas, antes escondidas pela floresta.
"RIO BRANCO - Descobertos no Acre, os geoglifos ganharam repercussão nacional e internacional em 1977. Em entrevista ao, a atual responsável pelos estudos, pesquisadora Joanna Troufflard, conta que a identificação de novas formas geométricas na Amazônia se intensificou a partir de 2005, por meio de imagens de satélite. Até 2001, eram conhecidos apenas 24. O número saltou para 120 em 2005, e hoje são cerca de 300 somente no Acre. ..."
Long Before Making Enigmatic Earthworks, People Reshaped Brazil’s Rain Forest reports on Jenny Watling recent research and has two great aerial images. Good science writing by Joanna Klein for the New York Times.
Covering Watling's research, Charlie Wood writes, "Mysterious earthworks in Western Brazil known as 'geoglyphs' might hold historical lessons about sustainable management of the Amazon, and forests in general." Do these ancient 'geoglyphs' hold a secret to preserving the Amazon?
Geoglifos da Amazônia Ocidental: Evidência de Complexidade Social entre Povos da Terra Firme 2007
A arqueologia do Estado do Acre tor-nou-se conhecida a partir de 1977 comas investigações realizadas pelo Programa Nacional de Pesquisas Arqueológicasna Bacia Amazônica - PRONAPABA. Ondemar Ferreira Dias Jr. e Franklin Levy, do Instituto de Arqueologia Brasileira, foram os primeiros a identificar e registrar sítios arqueológicos na região, cadastrando, até 1980, 70 sítios ...
"Mais de 800 geoglifos esperam por pesquisas na Amazônia. 17/02/2020
Um total de 818 geoglifos na Amazônia Internacional esperam para serem estudados. Os desenhos geométricos feitos na terra precisam de mais pesquisas para terem sua real função definida. Segundo a historiadora e arqueóloga do Instituto do Patrimônio Histórico do Acre, Ivandra Rampanelli, em sua tese de doutorado, 523 estão no Acre, 144 no Amazonas, 71 em Rondônia e 80 na Bolívia. ...."

amazon geoglyph

Atacama Desert Art and Archaeology
placemarks, geoglyphs and more: atacama.kml

Ancient Monument Placemarks


Acre geoglyphs aerial image


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"Antiquity willfully veils the truth so that the fool will go astray and only the wise mayknow." 
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