On the northern slopes of the Sierra del Salto, near the village of the same name in the state of Durango, the Presidio River moves southeastward and makes a journey of 167 kilometers. Its catchment area is 5,614 square kilometers, with an average annual expenditure of 900 million cubic meters, a maximum of 2,225 and a minimum of 550 million cubic meters. Populations on its banks are Los Cocos, El Zapote, El Placer, El Tecomate, Copala, El Recodo, Porras, Villa Unión, Alley Ostial, and Alley Rosa.