Monte Alegre várzea

The Monte Alegre várzea is a seasonally flooded forest ecoregion of the central and lower Amazon basin in northern Brazil, following the Amazon, Madeira, and Purus rivers, with an isolated patch along the Mamoré River on the Brazil–Bolivia border. These várzea forests grow along whitewater rivers, which carry heavy sediment from the Andes and rise by roughly 6 to 12 meters to inundate the land for as long as eight months each year, shaping a mosaic of flood-adapted trees, palms, shrubs, herbs, and tall riverside grasses. Characteristic plants include palms such as açaí (Euterpe oleracea), Mauritia flexuosa, and Astrocaryum jauari, hardwoods like Virola surinamensis and Calycophyllum spruceanum, and fruit-bearing species such as Vitex cymosa, alongside cane grasses like Gynerium sagittatum. The climate is equatorial and consistently warm and wet, with annual rainfall generally lower in the east and higher toward the western Madeira. The region supports about 200 mammal species, including jaguar, tapir, and the endemic Santarém marmoset, plus well over 600 bird species, yet the WWF classifies it as Critical/Endangered owing to gold-mining contamination and clearing of floodplain forest for cattle pasture.

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The countries, US states, and Canadian provinces this ecoregion touches, from a spatial join of its RESOLVE polygon against Natural Earth boundaries.