The Río Desaguadero is one of Argentina's most significant river systems, stretching an impressive 1,498 kilometers (931 miles) through the arid heartland of west-central Argentina. Rising near the Tipas volcano in La Rioja at approximately 5,500 meters (18,000 feet) elevation, the river flows southward through San Luis Province before ultimately joining the Colorado River in La Pampa Province near Pichi Mahuida. With a drainage basin of roughly 260,000 square kilometers, this is a vast and geographically diverse waterway that transitions through dramatically different landscapes along its course. In its upper reaches the river is known locally as the Bermejo or Vinchina, while in its lower stretches it takes on the name Salado — a nod to the increasing salinity that characterizes the lower portions of the system. The river's passage through San Luis Province represents a particularly interesting stretch for anglers, where the interplay of semi-arid terrain, variable flows, and a mixed fish community creates a unique fishing environment unlike the more celebrated Patagonian rivers to the south.