   thumb|left|275px|casa de piedra dam at the colorado river  the colorado river (, ) is a river in the south of argentina. the colorado river marks most of the political boundary between the argentine provinces of neuquÃ©n and mendoza, and between rio negro and la pampa. its man-made dam, 'embalse casa de piedra,' serves both to generate hydroelectricity for the arid region the river traverses, and to regulate the river's water level. ==course== its sources are on the eastern slopes of the andes in the same latitude as the chilean volcano tinguiririca (about 34Â° 48' s.), and it pursues a generally east-southeast course to the atlantic ocean, where it discharges about 100-120 kilometers south of bahÃ­a blanca, through several channels of a delta of the uniÃ³n bay extending from latitude 39Â° 30' to 39Â° 50' s. its total length is about , of which about , from the coast up to pichi mahuida, are navigable for vessels of up to 2 metres (7&nbsp;ft) draft. it is nearly 2,000&nbsp;km if calculated rÃ­o desaguadero within. the river has usually been described as formed by the confluence of the grande and the barrancas. however, since the barrancas is only a small stream compared to the grande, it is more accurate to describe the barrancas as a tributa
Geography_of_Buenos_Aires_Province Geography_of_RAo_Negro_Province Rivers_of_Argentina Rivers_of_Mendoza_Province