Drainage basin - Wikipedia

New River (Kanawha River tributary) - Wikipedia

Project area: Mura River Basin (www.wikipedia.com)

Danube - Wikipedia

List of rivers of Costa Rica : By drainage basin Wikipedia, the free encyclopedia »

Watersheds of North America - Wikipedia

Monongahela River - Wikipedia

File:Figure of a drainage basin.svg - Wikipedia

Nile - Wikipedia

Drainage Basin: From Wikipedia, The Free Encyclopedia

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Snake River - Wikipedia

Lumber River - Wikipedia

Elements of a drainage basin (Courtesy Wikipedia).

Wild Rice River (North Dakota) - Wikipedia

File:Yangtze River drainage basin map.svg - Wikipedia