Macacu River

The Macacu River (Rio Macacu) is a river of Rio de Janeiro state in southeastern Brazil.

Course
The Macacu River is born in the Serra dos Órgãos at about 1700 m in the municipality of Cachoeiras de Macacu, and runs for about 74 km to its junction with the Guapimirim River. The basin of the Macacu River is partly protected by the 19,508 ha Bacia do Rio Macacu Environmental Protection Area, part of the Central Rio de Janeiro Atlantic Forest Mosaic. The Macacu River flows through a flat region of mangroves in the 1,936 ha Guanabara Ecological Station before discharging into the east of Guanabara Bay near the city of Rio de Janeiro.