Fig. 2: Seasonally flooded areas (in green shades) within the Solimões-Amazon River valley and main tributaries in western, central and eastern Amazonia.

Upland areas are shown in yellow-red shades. a White rectangles highlight areas sampled for OSL and radiocarbon (14C) dating in this study. Elevation profiles A’–A”, B1’–B1” and B2’–B2” are shown in Fig. 6. b Solimões River main stem between the Tefé and Coari Rivers. c Anavilhanas archipelago in the Negro River. d Solimões-Amazon River main stem and lower Madeira River. e Downstream sector of the Tapajós River and confluence with the Amazon River. f Tabuleiro do Embaubal archipelago in the lower Xingu River. g Xingu River in the Brazilian Shield. Main cities are shown for location.