Rivers join downstream, flow downhill, and eventually meet an ocean or terminal lake: These are fundamental rules of how waterways and basins are supposed to work. But rules are made to be broken.

"These hydrologic oddities illustrate how much we have still to learn about Earth's dynamic surface," researchers said in a ...

Some 300 years ago, non-Indigenous travelers along the Upper and Middle Orinoco River—one of the world’s largest rivers, its flows looping for 1,400 miles through Colombia and Venezuela ...

Compared to many of the world’s river systems, the Orinoco is relatively intact. But this may not last for long as the river and its surrounding areas are threatened by pollution and mining activities ...

South America's Casiquiare River, for example, is a navigable waterway that connects the continent's two largest watersheds, the Orinoco and Amazon basins, by acting as a distributary of the ...

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Peter Murphy In November 1964, a young American anthropologist named Napoleon Chagnon disembarked from a motorized rowboat after traveling for days up the Orinoco River into the territory of the ...

It lives only in the rivers and creeks of the Amazon, Orinoco, and La Plata river systems. These huge members of the weasel family swim by propelling themselves with their powerful tails and ...