These saline basins extend down to the lower terraces of Cordoba, Mendoza and La Pampa.
Some of the principal affluents are the Vinchina and Jachal, or Zanjon, which flow into the Vermejo, the Patos, which flows into the San Juan, and the Mendoza, Tunuyan and Diamante which flow into the Desaguadero, all of these being Andean snow-fed rivers.
The names, area and population of the provinces and territories are as follows: The principal towns, with estimated population for 1905, are as follows: Buenos Aires (1,025,653), Rosario (129,121), La Plata (85,000), Tucuman (55,000), Cordoba (43,000), Sante Fe (33, 200), Mendoza (32,000), Parana.
The gauge is broken at Mendoza, the Buenos Aires and Pacific having a gauge of 5 ft.
In the Andean provinces of Mendoza, San Juan, Catamarca and Rioja viticulture attracts much attention, and the area in vineyards in 1901 was 109,546 acres, only 18% of which was outside the four provinces named.