It begins in the north of the Tinogasta Department of Catamarca Province, at the confluence of several rivers created by the melting of snow and precipitation in the high Andean peaks, such as the volcano Nevado Incahuasi (6,638 meters), Cerro El Muerto (6,488 metres) and Cerro Negro of Laguna Verde (5,764 metres), which dominates in addition the basin of Salina of Laguna Verde.