The Ventuari River is the largest tributary of the Orinoco in southern Venezuela.[1] The Ventuari flows from south-central Venezuela in the Guiana Highlands southwest into the Orinoco River. It is 520 km (320 mi) long and its major tributary is the Manapiare River.
Hitchcock, Charles B. La región Orinoco Ventuari. Relato de la Expedición Phelps al Cerro Yaví. Caracas: Ministerio de Educación Nacional, Imprenta El Compás, 1984 (Translated from an older English Edition: The Orinoco - Ventuari Region. American Geographical Society, 1947).