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| | The Great Plains and its Environments |
 | | In the Dakotas, the dividing line is the Coteau du Missouri, a belt of hills fifty to seventy five miles east of the Missouri River, roughly paralleling that stream, and continuing into southern Saskatchewan from the northwestern corner of North Dakota. |
 | | East and north of the Coteau belt, the bedrock has been deeply buried by glacial debris and the land surface owes its form primarily to the activity of the continental ice sheets from the north. |
 | | Along the Missouri and other major streams, and southward along the eastern part of our area, these belts are from two to ten miles wide, covering the valley bottoms, fringing the bluffs, and sometimes extending onto the adjacent uplands. |
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