The selected location is:

The elevation is 549 m ( 1800 ft )
The gradient is: 0.7 percent
The aspect direction is: 187.1 degrees or S
The local roughness is: 0.6 or slight
The location as decimal degrees (X,Y;Z) = -100.5073, 44.6294; 549 m

The state and county are South Dakota: Sully County 46119
The HUC is Lower Lake Oahe 10130105; Place point in HUC
The Omernik ecoregion is Northwestern Great Plains (less typical) 43
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Nearby named places (in order by distance)

1. Plum Creek head; -100.5073, 44.6294 at a distance of 2 m
2. Okobojo Creek Recreation Area; South Dakota: Sully Co. -100.4648, 44.6078 at a distance of 4140 m
3. Grand View, Township of; South Dakota: Sully Co. -100.4976, 44.6700 at a distance of 4574 m
4. Plum Creek mouth; South Dakota: Sully Co. -100.5296, 44.5908 at a distance of 4642 m
5. Dry Creek head; -100.5521, 44.5967 at a distance of 5087 m
6. Lewellyn Park, Township of; South Dakota: Sully Co. -100.5179, 44.5833 at a distance of 5193 m
7. Sonnenschein Number 2 Dam; South Dakota: Stanley Co. -100.5537, 44.5883 at a distance of 5870 m
8. Sully Creek head; -100.5115, 44.6822 at a distance of 5875 m
9. Prairie View School; South Dakota: Sully Co. -100.4465, 44.6631, ( 1810 ft ) at a distance of 6105 m
10. Dry Creek mouth; South Dakota: Sully Co. -100.5537, 44.5839 at a distance of 6258 m

The 7.5 minute series topographic maps for that area