The selected location is:

The elevation is 640 m ( 2100 ft )
The gradient is: 0.0 percent
There is no aspect direction.
The local roughness is: 0.0 or flat
The location as decimal degrees (X,Y;Z) = -100.0785, 45.2183; 640 m

The state and county are South Dakota: Potter County 46107
The HUC is Lower Lake Oahe 10130105; Place point in HUC
The Omernik ecoregion is Northeastern Great Plains (more typical) 45
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Nearby named places (in order by distance)

1. Little Cheyenne Creek head; -100.0785, 45.2183 at a distance of 1 m
2. Hanson Cemetery; South Dakota: Potter Co. -100.0829, 45.2025, ( 2021 ft ) at a distance of 1791 m
3. Gene Rock Dam; South Dakota: Potter Co. -100.0537, 45.2233 at a distance of 2026 m
4. Joe Mangin Dam; South Dakota: Potter Co. -100.0537, 45.1933 at a distance of 3395 m
5. Fayette, Township of; South Dakota: Potter Co. -100.1129, 45.1944 at a distance of 3791 m
6. J Willey Dam; South Dakota: Potter Co. -100.1071, 45.1900 at a distance of 3867 m
7. Fayette School; South Dakota: Potter Co. -100.1023, 45.1872, ( 1978 ft ) at a distance of 3931 m
8. W Combellick Dam; South Dakota: Potter Co. -100.1221, 45.2450 at a distance of 4530 m
9. Bartels Dam; South Dakota: Potter Co. -100.0671, 45.1683 at a distance of 5630 m
10. R Lemler Dam; South Dakota: Potter Co. -100.1404, 45.1900 at a distance of 5793 m

The 7.5 minute series topographic maps for that area