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In page Crook County, Wyoming:

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According to the US Census Bureau, the county has a total area of 2,865 square miles (7,420 km2), of which 2,854 square miles (7,390 km2) is land and 11 square miles (28 km2) (0.4%) is water.[1] The lowest point in the state of Wyoming is located on the Belle Fourche River in Crook County, where it flows out of Wyoming and into South Dakota.[citation needed]