For other uses, see Orinoco (disambiguation).
|Source||Hydrological source (Main stem)|
|location||Cerro Delgado-Chalbaud, Parima Mountains, Venezuela|
|elevation||1,047 m (3,435 ft)|
|2nd source||Geographical source (Orinoco-Guaviare-Guayabero-Papamene-Sorrento)|
|location||Headwaters of Rio Sorrento, Paramo de Sumapaz, Meta, Colombia|
|elevation||3,530 m (11,580 ft) (approximately)|
|location||Atlantic Ocean, Venezuela|
|elevation||0 m (0 ft)|
|Length||2,250 km (1,400 mi)|
|Basin size||880,000 km (340,000 sq mi)|
|average||37,000 m/s (1,300,000 cu ft/s)|
|minimum||21,000 m/s (740,000 cu ft/s)|
|maximum||54,000 m/s (1,900,000 cu ft/s)|
The Orinoco River and its tributaries are the major transportation system for eastern and interior Venezuela and the Llanos of Colombia.
The environment in the Orinoco's basin is extremely diverse; it hosts a wide variety of flora and fauna.
The river's name is derived from the Warao term for "a place to paddle", itself derived from the terms güiri (paddle) and noko (place) i.e. a navigable place.
Its source at the Cerro Delgado–Chalbaud, in the Parima range, was not explored until 453 years later, in 1951.
The source, near the Venezuelan–Brazilian border, at 1,047 metres (3,435 ft) above sea level (), was explored in 1951 by a joint French-Venezuelan expedition.
In 1531, starting at the principal outlet in the delta, the Boca de Navios, Diego de Ordaz sailed up the river to the Meta.
In 1595, after capturing de Berrio to obtain information while conducting an expedition to find the fabled city of El Dorado, the Englishman Sir Walter Raleigh sailed down the river, reaching the savanna country.
He published extensively on the river's flora and fauna.
The sources of the Orinoco River, located at Cerro Carlos Delgado Chalbaud (2º19’05” N, 63º21’42” W), were discovered in 1951 by the French-Venezuelan expedition that went back and explored the Upper Orinoco course to the Sierra Parima near the border with Brasil, headed by Venezuelan army officer Frank Risquez Iribarren.
After following the Casiquiare to the Orinoco River they hovered thru perilous Rapids of Maipures and Atures.
The Orinoco was then traversed down to its mouths in gulf of Paria and then to Port of Spain.
The primary purpose of the expedition was filming for the BBC series "The World About Us" the episode "The Last Great Journey on Earth from Amazon to Orinoco by Hovercraft", aired in 1970, and demonstrate the abilities of a hovercraft, thereby promoting sales of this British invention.
The first powerline crossing of the Orinoco River was completed in 1981 for an 800 kV TL single span of 1,200 metres (3,900 ft) using two towers 110 metres (360 ft) tall.
In 1992, an overhead power line crossing for two 400 kV-circuits was completed just west of Morocure (between the cities of Ciudad Bolivar and Ciudad Guayana), north of the confluence of Routes 1 and 19.
It had three towers, and the two spans measured 2,161 metres (7,090 ft) and 2,537 metres (8,323 ft), respectively.
The course of the Orinoco forms a wide ellipsoidal arc, surrounding the Guiana Shield; it is divided in four stretches of unequal length that very roughly correspond to the longitudinal zonation of a typical large river:
- Upper Orinoco – 286 kilometres (178 mi) long, from its headwaters to the rapids Raudales de Guaharibos, flows through mountainous landscape in a northwesterly direction
- Middle Orinoco – 805 kilometres (500 mi) long, divided into two sectors, the first of which ca. 515 kilometres (320 mi) long has a general westward direction down to the confluence with the Atabapo and Guaviare rivers at San Fernando de Atabapo; the second flows northward, for about 290 kilometres (180 mi), along the Venezuelan–Colombian border, flanked on both sides by the westernmost granitic upwellings of the Guiana Shield which impede the development of a flood plain, to the Atures rapids near the confluence with the Meta River at Puerto Carreño
- Lower Orinoco – 959 kilometres (596 mi) long with a well-developed alluvial plain, flows in a northeast direction, from Atures rapids down to Piacoa in front of Barrancas
- Delta Amacuro – 200 kilometres (120 mi) long that empties into the Gulf of Paría and the Atlantic Ocean, a very large delta, some 22,500 km (8,700 sq mi) and 370 kilometres (230 mi) at its widest.
At its mouth, the Orinoco River forms a wide delta that branches off into hundreds of rivers and waterways that flow through 41,000 km (16,000 sq mi) of swampy forests.
In the rainy season, the Orinoco River can swell to a breadth of 22 kilometres (14 mi) and a depth of 100 metres (330 ft).
A peculiarity of the Orinoco river system is the Casiquiare canal, which starts as an arm of the Orinoco, and finds its way to the Rio Negro, a tributary of the Amazon, thus forming a 'natural canal' between Orinoco and Amazon.
Major rivers in the Orinoco Basin
- Apure: from Venezuela through the east into the Orinoco
- Arauca: from Colombia to Venezuela east into the Orinoco
- Atabapo: from the Guiana Highlands of Venezuela north into the Orinoco
- Caroní: from the Guiana Highlands of Venezuela north into the Orinoco
- Casiquiare canal: in SE Venezuela, a distributary from the Orinoco flowing west to the Negro River, a major affluent to the Amazon
- Caura: from eastern Venezuela (Guiana Highlands) north into the Orinoco
- Guaviare: from Colombia east into the Orinoco
- Inírida: from Colombia southeast into the Guaviare.
- Meta: from Colombia, border with Venezuela east into the Orinoco
- Ventuari: from eastern Venezuela (the Guiana Highlands) southwest into the Orinoco
- Vichada: from Colombia east into the Orinoco
The Orinoco crocodile is one of the rarest reptiles in the world.
Its range in the wild is restricted to the middle and lower Orinoco River Basin.
More than 1000 fish species have been recorded in the river basin and about 15% are endemic.
River steamers carry cargo as far as Puerto Ayacucho and the Atures Rapids.
El Florero iron mine
In 1926, a Venezuelan mining inspector found one of the richest iron ore deposits near the Orinoco delta, south of the city of San Felix on a mountain named El Florero.
Full-scale mining of the ore deposits began after World War II, by a conglomerate of Venezuelan firms and US steel companies.
At the start in the early 1950s, about 10,000 tons of ore-bearing soil was mined per day.
Eastern Venezuelan basin
Maturin forms the eastern subbasin and Guarico forms the western subbasin.
Recreation and sports
Since 1973, the Civil Association Nuestros Rios son Navegables organize the Internacional Rally Nuestros Rios son Navegables, a motonautical round trip of over 1,200 kilometers through the Orinoco, Meta and Apure Rivers.
Starting out from Ciudad Bolívar or San Fernando de Apure, is the longest fluvial rally in the world with the participation of worldwide competitors, more than 30 support boats, logistics teams, thousands of tourists and fans travel.
The boats had an average speed of 120 miles per hour.
Since 1991, the Paso a Nado Internacional de los Rios Orinoco–Caroní has been celebrated every year, on a Sunday close to 19 April.
Worldwide, this swim-meet has grown in importance, and it has a large number of competitors.
The 26th meet was held in 2016.
- Adaheli, the Sun in the mythology of the Orinoco region
- Orinoco Flow - the song uses the Orinoco and its environs as a theme for its lyrics
Credits to the contents of this page go to the authors of the corresponding Wikipedia page: en.wikipedia.org/wiki/Orinoco.