The selected location is:

The elevation is 609 m ( 1998 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) = -100.6712, 44.9719; 609 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. Fast Horse Ranch; South Dakota: Dewey Co. -100.6712, 44.9719 at a distance of 2 m
2. Corral Creek head; -100.6696, 44.9661 at a distance of 659 m
3. Little Willow Creek head; -100.6796, 44.9908 at a distance of 2201 m
4. Means Ranch; South Dakota: Dewey Co. -100.6437, 44.9519 at a distance of 3107 m
5. Clark Ranch; South Dakota: Dewey Co. -100.7229, 44.9647 at a distance of 4158 m
6. Henry Ducheneaux Ranch; South Dakota: Dewey Co. -100.6076, 44.9428 at a distance of 5970 m
7. West Branch Willow Creek head; -100.6954, 45.0264 at a distance of 6349 m
8. Dan Gray Ranch; South Dakota: Dewey Co. -100.6087, 45.0111 at a distance of 6576 m
9. No Heart Butte; South Dakota: Dewey Co. -100.6882, 44.9106, ( 1830 ft ) at a distance of 6946 m
10. West Branch Tall Prairie Chicken Creek mouth; South Dakota: Dewey Co. -100.7587, 44.9525 at a distance of 7234 m

The 7.5 minute series topographic maps for that area