1 The Kenai
It is a river in the Kenai Peninsula of south central Alaska. It runs 82 miles (132 km) westward from Kenai Lake in the Kenai Mountains, through the Kenai National Wildlife Refuge and Skilak Lake to its outlet into the Cook Inlet of the Pacific Ocean near Kenai and Soldotna, Alaska.
2 Caño Cristales:
It is a Colombian river located in the Serrania de la Macarena province of Meta. It The river is commonly called the "River of Five Colors" or the "Liquid Rainbow", and is regarded as the most beautiful river in the world due to its striking colors.
4 The Neretva:
Neretva is the largest river of the eastern part of the Adriatic basin. It provides flood protection, power and water storage, and is recognized for its natural beauty and diversity of its landscape. With its freshwater resource, Neretva is regarded as one of the most valuable natural resources of Bosnia and Herzegovina and Croatia.
10 The Rhine:
It is a European river beginning in the Swiss canton of Graubünden in the southeastern Swiss Alps, forms part of the Swiss-Austrian, Swiss-Liechtenstein border, Swiss-German and then the Franco-German border, then flowing through the Rhineland and eventually empties into the North Sea in the Netherlands.