The Missouri River, which flows south into the Mississippi River, and the Red River of the North, which flows north into Lake Winnipeg and ultimately into Hudson Bay, drain North Dakota. The principal tributaries of the Missouri in North Dakota are the Cannonball, Heart, James, Knife, and Little Missouri rivers.
Tributaries of the Red that flow through North Dakota include the Sheyenne, Goose, Park, Pembina, and Souris rivers.
Many small lakes dot the glaciated portion of North Dakota. Devils Lake is the largest natural lake in the state. Its waters are salty because it lacks an outlet. There are also many artificial lakes. The largest, Lake Sakakawea, is a reservoir on the Missouri River north of Bismarck and is one of the largest lakes in the United States, covering 1,458 sq km (563 sq mi). Other important reservoirs include Arrowhead, Darling, and Heart Butte. Lake Oahe, also a reservoir on the Missouri, is shared between North and South Dakota. "North Dakota" © Emmanuel BUCHOT, Encarta, Wikipedia
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