Aconcagua River

The Aconcagua River is a river in Chile that rises from the joint of two minor tributary rivers at 1,430 metres (4,690 ft) above sea level in the Andes, Juncal river from the east (which rise in the Juncal mountain) and Blanco river from the south east. 

Aconcagua river flows westward through a broad valley, the Valle del Aconcagua (Aconcagua's Valley), and enters the Pacific ocean 20 kilometres (12 mi) north of Valparaiso.The river has a course of about 142 kilometres (88 mi), and its waters irrigate the most populous sections of the Chilean provinces of San Felipe de Aconcagua and Los Andes, being the most important economic resource of those regions.