The main courses within these systems are of an ephemeral nature, among which the Singuel, Copalayo, Tarón, Quebrada Honda, Vicuña Muerta and Sijes rivers are most notable.Finally, it is necessary to clarify the delineation criterion of the Centenario - Ratones Basin in its northern portion, more precisely in a narrow portion of approximately 5 km directly to the north of the Pastos Grandes salar depression.