Sheridan County, like the rest of the region, has a mountainous interior. This mountainous interior features deep and steep valleys, formed by major rivers running through it.
Thomas County is a county of USA. They belong to the Nebraska state. It has a population of 297 citizens. In 2007, 51% of people in the county living in the metropolitan area of the capital.
Sioux County has a very healthy climate, as its 251 citizens bear this out. Comparing Sioux County with other provinces, their communications within USA can be improved.