The Urugua-í River, also called the Marambas or Grande River, has a length of about 100 kilometres (62 mi), including the reservoir formed by the Urugua-í Dam.

Tributaries include the Sarita River, Arroyo de las Cabeceras and Uruzú River.

[1] The Urugua-í River flows through the southern part of the Urugua-í Provincial Park in a southeast – northwest direction and is impounded by the Urugua-í Dam to the west of the park.

[2] The park was created in part to compensate for the flooding of 8,800 hectares (22,000 acres) of the lower Urugua-í River basin caused by construction of the dam.

This article related to a river in Argentina is a stub.