Nhamundá River

The Nhamundá River or Jamundá River (called Yamundá River in Spanish) is a river in northern Brazil. It marks part of the northeastern boundary between the states of Amazonas and Pará. This river is about 300 kilometers long and starts in the plateau called Serra do Jatapu near where the states of Roraima, Amazonas, and Pará meet.

From there, the Nhamundá River flows southeast, naturally separating Amazonas and Pará. It passes through the Nhamundá-Mapuera Reserve before joining the Trombetas River near the city of Oriximiná. The Nhamundá River is the last major river joining the Trombetas before it meets the huge Amazon River. The river’s mouth is found about 480 kilometers east of Manaus.

Three towns along the lower part of the river—Terra Santa, Nhamundá, and Faro—can only be reached by boat.