a river in Venezuela, a right tributary of the Orinoco.Length, 745 km; basin area, 52, 000 sq. km. It originates in thesouth-central part of the Guiana Highlands, cutting through itto form rapids and waterfalls. There is considerable variation inthe water discharge (with the maximum in the summer). Theaverage annual discharge is 2, 720 cu m per sec. The Caura Riveris navigable for 150 km from its mouth.