Limay River
Río Negro is one of the six provinces that make up Argentine Patagonia. It is bounded to the north by the Colorado River which separates it from La Pampa Province, to the east by the Atlantic Ocean and to the west by the Andes and the Limay River (serves as the natural border with Neuquén Province). The 42nd parallel south marks the southern limit of the province. With an area of , it is the 4th largest province by area.