Map of the Amazon River drainage basin with the Amazon River highlightedThe 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. That links two major river systems, a so-called bifurcation.
Map of the Amazon River drainage basin with the Amazon River highlightedThe 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. That links two major river systems, a so-called bifurcation.