# Guaviare River

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.

## Discharge

Average, minimum and maximum discharge at Coayare (Guayare), 3°57′30.3876″N 67°50′5.748″W﻿ / ﻿3.958441000°N 67.83493000°W﻿ / 3.958441000; -67.83493000 (Lower Guaviare). Period: 1985–2015.
| Year | Discharge (m$^3$/s) | Discharge (m$^3$/s) | Discharge (m$^3$/s) |
| Year | Min | Mean | Max |
| 1985 | 1,206.5 | 6,426.17 | 12,716 |
| 1986 | 2,006.7 | 6,687.58 | 12,885 |
| 1987 | 1,620.4 | 7,063.17 | 12,664 |
| 1988 | 2,140 | 6,415.83 | 15,906 |
| 1989 | 2,674 | 6,843.67 | 15,800 |
| 1990 | 2,237 | 7,433.17 | 15,274 |
| 1991 | 850 | 6,999.33 | 14,910 |
| 1992 | 964 | 5,893.83 | 13,866 |
| 1993 | 1,031 | 7,613.92 | 13,229 |
| 1994 | 826 | 7,025.67 | 13,722 |
| 1995 | 1,663 | 6,014.08 | 12,689 |
| 1996 | 1,565 | 6,928.83 | 13,413 |
| 1997 | 2,232 | 6,634.5 | 11,841 |
| 1998 | 2,342 | 7,370.42 | 13,281 |
| 1999 | 2,775 | 7,311.92 | 11,574 |
| 2000 | 1,605 | 6,894.33 | 14,291 |
| 2001 | 1,835 | 6,289.17 | 14,500 |
| 2002 | 1,081 | 5,716.25 | 13,978 |
| 2003 | 921.1 | 7,002.83 | 13,319 |
| 2004 | 938.8 | 7,087.42 | 14,483 |
| 2005 | 1,381 | 6,411.08 | 14,500 |
| 2006 | 1,598 | 7,227 | 14,256 |
| 2007 | 962.4 | 7,149.92 | 14,201 |
| 2008 | 1,177 | 6,649.83 | 13,860 |
| 2009 | 1,795 | 5,806.42 | 14,465 |
| 2010 | 891.6 | 6,587.75 | 13,270 |
| 2011 | 1,356 | 7,036 | 13,030 |
| 2012 | 1,780 | 7,183.33 | 15,157 |
| 2013 | 1,111 | 6,941.17 | 14,100 |
| 2014 | 1,016 | 7,050.83 | 14,830 |
| 2015 | 1,613 | 6,449.67 | 14,500 |
| Avg. | 1,522.4 | 6,778.9 | 13,877.4 |
Average discharge
| Period | Discharge |
| Near mouth 4°4′26.5656″N 67°43′14.8008″W﻿ / ﻿4.074046000°N 67.720778000°W﻿ / 4.074046000; -67.720778000 |||
| 1926–2011 | 7,529 m$^3$/s (265,900 cu ft/s) |
| 1971–2000 | 8,157.9 m$^3$/s (288,090 cu ft/s) |
| 1974–2008 | 8,416 m$^3$/s (297,200 cu ft/s) |
| | 7,400 m$^3$/s (260,000 cu ft/s) 8,200 m$^3$/s (290,000 cu ft/s) |
| Coayare (Guayare) 3°57′30.3876″N 67°50′5.748″W﻿ / ﻿3.958441000°N 67.83493000°W﻿ / 3.958441000; -67.83493000 |||
| 1971–2000 | 7,254.9 m$^3$/s (256,200 cu ft/s) |
| 1991–2020 | 7,389 m$^3$/s (260,900 cu ft/s) |
| 1985–2015 | 6,778.9 m$^3$/s (239,390 cu ft/s) |
| | 6,700 m$^3$/s (240,000 cu ft/s) |
| | 6,887 m$^3$/s (243,200 cu ft/s) |
| San José del Guaviare |||
| 1971–2000 | 1,594.8 m$^3$/s (56,320 cu ft/s) |
| | 1,930 m$^3$/s (68,000 cu ft/s) |
Sediment load at mouth ca 30 million ton/year.

## Tributaries

The main tributaries from the mouth:
| Left tributary | Right tributary | Length (km) | Basin size (km$^2$) | $^*$Average discharge (m$^3$/s) |
| Guaviare | Guaviare | 1,760 | 151,606.9 | 8,157.9 |
| Lower Guaviare |||||
| | Atabapo | 185 | 12,531.3 | 895 |
| | Inírida | 1,419 | 53,816.9 | 2,948.4 |
| Uvá | | | 14,813.9 | 782.6 |
| Middle Guaviare |||||
| | Caño Minisiare | | 2,335.5 | 119.3 |
| | Caño Mina | | 381.9 | 20 |
| Caño Cumaral | | | 391.5 | 21.3 |
| Iteviare | | | 4,618 | 221.3 |
| Siare | | | 4,574.5 | 197.9 |
| Caño Araguato | | | 712.3 | 38.5 |
| | Caño Macú | | 781.1 | 37 |
| Caño Yamus | | | 433 | 18.3 |
| Caño Jabón | | | 1,246.7 | 57.3 |
| Ovejas | | | 1,639.1 | 88.1 |
| Caño El Melón | | | 775.9 | 41 |
| Upper Guaviare |||||
| Ariari | | | 11,638.6 | 600.3 |
| | Guayabero | 540 | 24,345.9 | 986.2 |
$^*$1971–2000