Guaviare River

Guaviare
The Guaviare River as seen from the air
Location
CountryColombia
Physical characteristics
Source 
  locationConfluence of Ariari and Guayabero Rivers
  coordinates2°34′52.9212″N 72°46′17.0328″W / 2.581367000°N 72.771398000°W / 2.581367000; -72.771398000
  elevation178 m (584 ft)
2nd sourceAriari
  locationCordillera Oriental
  coordinates3°54′31.698″N 74°6′30.2004″W / 3.90880500°N 74.108389000°W / 3.90880500; -74.108389000
  elevation4,040 m (13,250 ft)
3rd sourceGuayabero
  locationCordillera Oriental
  coordinates3°31′36.5952″N 74°28′27.3684″W / 3.526832000°N 74.474269000°W / 3.526832000; -74.474269000
  elevation3,080 m (10,100 ft)
Mouth 
  location
Orinoco
  coordinates
4°4′26.5656″N 67°43′14.8008″W / 4.074046000°N 67.720778000°W / 4.074046000; -67.720778000
  elevation
77 m (253 ft)
Length1,760 km (1,090 mi) - Guaviare–Guayabero
Basin size151,606.9 km2 (58,535.8 sq mi)
Discharge 
  locationNear mouth
  average(Period: 1926–2011)7,529 m3/s (265,900 cu ft/s)
Discharge 
  locationCoayare (3°57′30.3876″N 67°50′5.748″W / 3.958441000°N 67.83493000°W / 3.958441000; -67.83493000; Basin size: 138,899.1 km2 (53,629.2 sq mi)
  average(Period: 1985–2015)6,778.9 m3/s (239,390 cu ft/s)
  minimum(Year: 1994)826 m3/s (29,200 cu ft/s)
  maximum(Year: 1988)15,906 m3/s (561,700 cu ft/s)
Discharge 
  locationSan José del Guaviare (Basin size: 36,287.3 km2 (14,010.6 sq mi)
  average(Period: 1971–2000)1,594.8 m3/s (56,320 cu ft/s)
Basin features
ProgressionOrinocoAtlantic Ocean
River systemOrinoco River
Tributaries 
  leftAriari, Caño El Melón, Ovejas, Caño Jabón, Siare, Iteviare, Caño Cumaral, Uvá
  rightGuayabero, Caño Macú, Caño Araguato, Caño Mina, Caño Minisiare, Inírida, Atabapo

The Guaviare is a tributary of the Orinoco in Colombia. It flows together with the upper Orinoco (until here also called Río Parágua), which it clearly surpasses in length (altogether about 1,760 km) and water flow. Thus, the Guaviare is hydrologically the main stream of the Orinoco system.

The Guaviare has its source in two other rivers, the Ariari and the Guayabero, which in turn have their own sources in the eastern part of the Andes. At 1,760 km (1,090 mi) long, it is the longest tributary of the Orinoco and is navigable for 630 km (390 mi) of its total length. The Guaviare is considered the border between the Llanos and the Amazon Rainforest. Its main tributary is the Inírida River.