Araguaia River

Portuguese  Rio Araguaia,   river, central Brazil. It rises on the Brazilian Highlands near Alto Araguaia town in Mato Grosso state and flows north-northeast for 1,632 miles (2,627 km) to its junction with the Tocantins River, at São João do Araguaia. Its upper course forms the boundary between Mato Grosso state (west) and Goiás and southern Tocantins states (east). In midcourse the river divides into two channels