The selected location is:

The elevation is 494 m ( 1621 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) = -100.8568, 44.8567; 494 m

The state and county are South Dakota: Dewey County 46041
The HUC is Lower Lake Oahe 10130105; Place point in HUC
The Omernik ecoregion is Northwestern Great Plains (more typical) 43
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Nearby named places (in order by distance)

1. West Branch Rousseau Creek mouth; South Dakota: Dewey Co. -100.8568, 44.8567 at a distance of 3 m
2. Rousseau Creek head; -100.8573, 44.8567 at a distance of 42 m
3. East Branch Rousseau Creek mouth; South Dakota: Dewey Co. -100.8573, 44.8564 at a distance of 55 m
4. Dog Eagle Ranch; South Dakota: Dewey Co. -100.8387, 44.8783 at a distance of 2791 m
5. Rousseau Creek mouth; South Dakota: Dewey Co. -100.8429, 44.8275 at a distance of 3427 m
6. Sage Creek head; -100.9057, 44.8589 at a distance of 3875 m
7. Joes Creek head; -100.8026, 44.8611 at a distance of 4310 m
8. Fine Weather Draw head; -100.8782, 44.8189 at a distance of 4532 m
9. Marshell Ranch; South Dakota: Dewey Co. -100.9112, 44.8856 at a distance of 5367 m
10. Wager Ranch; South Dakota: Dewey Co. -100.8632, 44.9142 at a distance of 6408 m

The 7.5 minute series topographic maps for that area