Science: Orinoco

On the maps, the vast inland wilderness surounding the uncertain juncture of Venezuela, Colombia, Brazil gives the impression of being as well known to the world as the valley of the Mississippi. On the contrary, few white men have ever penetrated it. Here are the scenes of all sorts of fantastic romances, like Conan Doyle's The Lost World and W. H. Hudson's Green Mansions. Here is the fascinating stream called the Casiquiare, reputed to flow both ways and to connect the Rio Negro, largest northern tributary of the Amazon, with the Orinoco. Here...

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