Siluriformes - Catfishes
Cichliformes - Cichlids
Gymnotiformes - South American knifefish
Characiformes - Characins
Osteoglossiformes - Bony tongues
Clupeiformes - Herrings
Pleuronectiformes - Flatfishes
Myliobatiformes - Stingrays
The Casiquiare river is a 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.
It is the world’s largest river of the kind that links two major river systems, a so-called bifurcation. The area forms a water divide, more dramatically at regional flood stage.
