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Mamoré(məmo͝orĕ`), river, c.600 mi (965 km) long, formed by tributaries rising in the Andes and plains of central Bolivia. It flows north, past Trinidad, to the Brazilian border. After forming part of the Bolivia-Brazil border, the Mamoré joins with the Beni River to form the Madeira River. With the Río Grande, its chief tributary, the Mamoré flows c.1,100 mi (1,770 km) through the Bolivian lowlands (where it is navigable) and the Cordillera Oriental.
a river in South America (chiefly in Bolivia). It joins the Beni River to form the Madeira River of the Amazon system. Length, about 2,000 km.
The Mamoré flows out of the eastern ranges of the central Andes and crosses savannahs and savannah forests on the plains of Bolivia. There are rapids downstream. High water (as high as 8 m where the Guaporé River flows into the Mamoré) and flooding take place from February to April. The river is navigable for small ships to the city of Guajaré Mirim.