Mamoré River

Its larger tributaries are the Chapare, Secure, Apere, and Yacuma from the west, and the Ichilo, Guapay, Ivari, Manique and Guapore from the east.Taking into account its length only, the Guapay should be considered the upper part of the Mamore; but it is shallow and obstructed, and carries a much smaller volume of water.The Guapore also rivals the Mamore in length and volume, having its source in the Parecis plateau, Mato Grosso, Brazil, a few miles from streams flowing north-ward to the Tapajos and Amazon, and southward to the Paraguay and Paraná rivers.In 1874, Franz Keller gave the outflow of the Mamoré at mean water level, and not including the Guapore, as 41,459 cm3/sec (2,530 cub.[4] An extensive pre-Columbian civilization existed in the basin of the Mamore in the swampy area known as the Llanos de Moxos, in northeastern Bolivia.
Mamoré ProvinceIchilo RiverChimoré RiverBrazilBoliviaMadeira RiverGuayaramerínPuerto SilesMadeiraAmazonAtlantic OceanRiver systemChapareIsiboroYacumaRio GrandeGuaporéMadre de Dios RiverCochabambaChimoréSecureIchiloGuapayGuaporeParecis plateauMato GrossoTapajosParaguayParanáChimoredrainage basinLlanos de MoxosMamoré–Guaporé linguistic areaFood and Agriculture Organization of the United Nationspublic domainChisholm, HughEncyclopædia Britannica