The Rio Tocantins 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 Cacique mountains in the state of Maranhão and eventually empties into the Atlantic Ocean near the city of Belém. 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 water for agriculture and hydroelectric power generation. The river is vital for the communities that depend on its resources for their livelihoods.