The Orinoco (Spanish pronunciation: [oɾiˈnoko]) is one of the longest rivers in South America at 2,250 kilometres (1,400 mi). Its drainage basin, sometimes known as the Orinoquia,[citation needed] covers 880,000 km2 (340,000 sq mi), with 76.3 percent of it in Venezuela and the remainder in Colombia. It is the fourth largest river in the world by discharge volume of water. The Orinoco River and its tributaries are the major transportation system for eastern and interior Venezuela and the Llanos of Colombia. The environment and wildlife in the Orinoco's basin are extremely diverse.

Orinoco River
Río Orinoco
Orinoquia Bridge near Ciudad Guayana, Venezuela
Orinoco's drainage basin
RegionSouth America
Physical characteristics
SourceHydrological source (Main stem)
  locationCerro Delgado-Chalbaud, Parima Mountains, Venezuela
  coordinates2°19′05″N 63°21′42″W
  elevation1,047 m (3,435 ft)
2nd sourceGeographical source (Orinoco-Guaviare-Guayabero-Papamene-Sorrento)
  locationHeadwaters of Rio Sorrento, Paramo de Sumapaz, Meta, Colombia
  coordinates3°34′2″N 74°31′23″W (approximately)
  elevation3,530 m (11,580 ft) (approximately)
MouthDelta Amacuro
Atlantic Ocean, Venezuela
8°37′N 62°15′W[1]
0 m (0 ft)
Length2,250 km (1,400 mi)
Basin size880,000 km2 (340,000 sq mi)
  average37,000 m3/s (1,300,000 cu ft/s)
  minimum21,000 m3/s (740,000 cu ft/s)
  maximum54,000 m3/s (1,900,000 cu ft/s)