The region has many valleys that are crossed by the Negro and Grande rivers; these rivers join Cambiasca to form Dois Rios river, one of the main tributaries of Paraiba do Sul river.
Out in the river, there is the famous Meeting of the Waters, the phenomenon where the Rio Negro and the Rio Solimões rub up against each other but do not mix.
However, variations in the proportion of dinocyst taxa indicating an eutrophic environment reflect the input of nutrients transported mainly by the Brazilian Coastal Current (BCC) and partly discharged by the Rio Itajaí (the major river closest to the core site).
The island also had several rivers overflow including the Rio Minho and Rio Dogna.
The border region depends on two rivers: the Rio Bravo (Rio Grande), running down from the Rocky mountains, along the border and into the Gulf of Mexico, and the Colorado river, which follows the boundary between California and Arizona down into Mexico before spilling into the Gulf of California.
Manaus, Brazil, where the Rio Negro and Solimões rivers meet and the Amazon as we think of it begins.
One of them, the Rio Gonzalo farm, across the river from Caleta Gonzalo, is open to tourists.
The Rio Alias is a transverse river system developed within the Sorbas and Almeria Neogene sedimentary basins within the Internal Zone of the Betic Cordillera, southeast Spain.
That river link, between the Rio Chagres on the Caribbean side and the Rio Grande on the Pacific, allowed freshwater fish species from both sides to mingle.
The Rio Coto Brus passes Potrero Grande, downriver it joins the river Rio General to form the Rio Terraba which connects to Palmar Norte and Cortez.
The type locality was given as the Río Marañón, Brazil [ 21], but this river is in Peru, joining with the Rio Ucayali above Iquitos to become the Rio Solimões, which in turn joins with the Rio Negro to become the Amazon River of Brazil.
