The Tocantins River is a major river in Brazil, flowing approximately 2,640 kilometers (1,640 miles) through the central part of the country. It originates in the Serra do Caiapó mountain range and eventually empties into the Atlantic Ocean at the Marajó Bay. The river is an important waterway for transportation and supports various ecosystems along its banks. The Tocantins River basin is rich in biodiversity, home to numerous species of fish, birds, and other wildlife. It also plays a crucial role in the local economy, providing resources for fishing, agriculture, and hydroelectric power generation, with several dams constructed along its length.