1A river of South America, which rises in central Brazil and flows 2,640 km (1,640 miles) northwards, joining the River Pará to enter the Atlantic through a large estuary at Belém.
A river in South America that rises in central Brazil and flows 1,640 miles (2,640 km) north, joining the Pará River to enter the Atlantic Ocean through a large estuary at Belém.