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The western half of the state consists of the hilly Great Plains, and the northern part of the Badlands to the west of the Missouri River.
The state's high point, White Butte at, and Theodore Roosevelt National Park are located in the Badlands.
The region is abundant in fossil fuels including crude oil and lignite coal.
The Missouri River forms Lake Sakakawea, the third largest man-made lake in the United States, behind the Garrison Dam .< ref >

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