The Orinoco is one of the longest rivers in South America at 2,140 km (1,330 mi). Its drainage basin, sometimes known as the Orinoquia, covers approximately 1,000,000 km2 (390,000 sq mi), with 65% of it in Venezuela and 35% in Colombia. It is the third largest river in the world by discharge volume of water due to the high precipitation throughout its catchment area.