Quaraí (Spanish: Cuareim) is a watercourse that marks the limit of the northern part of Uruguay along the Brazil-Uruguay border. At the beginning of its course, it runs northwest, then heads west, finally ending up in the Uruguay River.
The word Quaraí is a composition of indigenous origin that in the Tupi-Guarani language means: "Rio das Garças", or even "Rio do Sol". Formerly in the Portuguese language the city was written Quarahy, but it was pronounced in the same way as the current one.
Collischonn, Bruno; Paiva, Rodrigo Cauduro Dias de; Collischonn, Walter; Meirelles, Fernando Setembrino Cruz; Schettini, Edith Beatriz Camano; Fan, Fernando Mainardi (2011). «Hydrological Modeling of a Basin with Intensive Water Use: Case of Rio Quaraí-RS» (PDF). RBRH – Brazilian Journal of Water Resources. 16 (4)