The Atuel River is a river located mainly in the south of the Argentine province of Mendoza, with its last part in La Pampa. It is a tributary of the Desaguadero River.
The Atuel is the longest river in Mendoza. It is born in the Andes range, at 3,250 metres above mean sea level, from the glacial Atuel Lake. It has a mean flow of 31.8 cubic metres per second, and its drainage basin covers 13,000 square kilometres. Its volume increases from November to March.
Wikipedia https://en.wikipedia.org/wiki/Atuel_River
Coordinates -34°50'2.455" N -68°30'56.838" E