- a river in S central Brazil, flowing N to the Tocantins River. 1600 miles (2575 km) long.
- a river flowing N from central Brazil to the Tocantins River. about 1100 miles (1770 km) long.
- a river in central Brazil, rising in S central Mato Grosso state and flowing north to the Tocantins River. Length: over 1771 km (1100 miles)