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The Orinoco Basin is the part of South America drained by the Orinoco river and its tributaries. The Orinoco watershed covers an area of about 990000 km 2 , making it the third largest in South America, covering most of Venezuela and eastern part of Colombia .
The boto and the giant otter inhabit the Orinoco River system. [29] 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. [30] More than 1000 fish species have been recorded in the river basin and about 15% are endemic. [31]
To the east the Orinoco wetlands and Orinoco Delta swamp forests occupy the Orinoco Delta. [2] The Llanos' main river is the Orinoco, which runs from west to east through the ecoregion and forms part of the border between Colombia and Venezuela. The Orinoco is the major river system of Venezuela. [3]
Map of the Amazon River drainage basin with the Amazon River highlighted The Amazon River drainage basin; with the Casiquiare River, a distributary of the Orinoco River flowing southward into the Negro River, in Venezuela, South America. As such, it forms a unique natural canal between the Orinoco and Amazon river systems.
The delta is fan-shaped, formed by the Orinoco River as it splits into numerous distributaries, called caños, which meander through the delta on their way to the sea.The main distributary is called the Rio Grande, which empties south-southeast through the southern portion of the delta, and the second major distributary is Caño Manamo, which runs northward along the western edge of the delta.
The second longest river in North America and the United States is the Mississippi River (2,320 mi (3,730 km)). The Rio Conchos (350 mi (560 km)) is the longest river in Mexico. The longest river in Canada is the Mackenzie River (1,080 mi (1,740 km)). Some of the longest or otherwise notable rivers include the rivers listed in the table below.
The Casiquiare river or canal (Spanish pronunciation: [kasiˈkjaɾe]) is a natural distributary of the upper Orinoco flowing southward into the Rio Negro, in Venezuela, South America. As such, it forms a unique natural canal between the Orinoco and Amazon river systems.
The Meta River and its tributaries. The Meta River is a major left tributary of the Orinoco River in eastern Colombia and southern Venezuela, South America.The Meta originates in the Eastern Ranges of the Andes and flows through the Meta Department, Colombia as the confluence of the Humea, Guatiquía and Guayuriba rivers.