Tercero River

The Tercero River (Spanish, Río Tercero, "third river"), also known as Ctalamochita, is the river of the Córdoba Province in Argentina with the most important water flow, 27.17 cubic metres per second (959 cu ft/s). It starts near the Calamuchita Valley, becomes navigable for boats of small to medium sizes as it flows through the plains, and flows 307 kilometres (191 mi) before reaching the Carcarañá River.

It has its origin near the Champaquí hill, in an area of annual precipitation of between 600 and 1,000 millimetres (24 and 39 in), near the Calamuchita Valley. Leaving the valley, it reaches the plains where four dams there have been constructed, called Cerro Pelado Dam, Arroyo Corto Dam, Embalse Río Tercero—with 54.3 square kilometres (21.0 sq mi) built in 1936—and Piedras Moras, which serve as flow regulators, and hydroelectricity production. But the lakes of the dams are also used for tourism and recreation; water sports and fishing.

The river the incursions into the wet Pampas area, which has an average rainfall of 730 millimetres (29 in) per year. It joins the Saladillo River (also called the Cuarto River) to form the Carcarañá River, a tributary of the Paraná River.