🇧🇴 Bolivia · Earthwork
Llanos de Moxos – Casarabe Culture Monuments
Late Intermediate, Casarabe culture · Casarabe (Moxos) savanna farmers
1,000 km of causeways + 147 forest-island cities (500–1400 CE) in seasonally flooded Beni savanna.
🇪🇨 Ecuador · Ancient city
Upano Valley Urban Complex
Formative to Regional Development (500 BCE–600 CE) · Kilamope (Upano) culture; Sangay phase Huapula
Lost Amazon cities (500 BCE–600 CE) under Upano forest—20 towns, 6,000 mounds and 25 km of roads revealed by 2024 LiDAR.
🇧🇷 Brazil · Ancient city
Kuhikugu (Xinguano Lost Cities)
Xinguano 800–1600 CE · Xinguano / Arawak
Cluster of 20+ pre-Columbian settlements in Xingu with causeways 50 m wide, plazas, reservoirs, showing dense urbanism (population 50k) in Amazon before 1492, built 800–1400 CE, described by Michael…
🇧🇷 Brazil · Geoglyph
Acre Geoglyphs (Geoglifos do Acre)
Pre-Columbian 1–1500 CE · Acre / Xinguano tradition
Hundreds of large ditched enclosures (squares, circles, U-shapes) revealed since 1977 by deforestation, built by pre-Columbian Amazonian cultures using forest clearance, dated 1–1500 CE, associated…