The selected location is:

The elevation is 191 m ( 627 ft )
The gradient is: 0.0 percent
There is no aspect direction.
The local roughness is: 0.5 or slight
The location as decimal degrees (X,Y;Z) = -90.0776, 40.4728; 191 m

The state and county are Illinois: Fulton County 17057
The HUC is Lower Illinois-Lake Chautauqua 07130003; Place point in HUC
The Omernik ecoregion is Central Corn Belt Plains (less typical) 54
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Nearby named places (in order by distance)

1. Big Sister Creek head; -90.0776, 40.4728 at a distance of 4 m
2. Bryant; Illinois: Fulton Co. -90.0918, 40.4661 at a distance of 1415 m
3. Little Sister School; Illinois: Fulton Co. -90.0559, 40.4625 at a distance of 2163 m
4. Little Sister Lake Dam; Illinois: Fulton Co. -90.0568, 40.4583 at a distance of 2384 m
5. Little Sister Lake; Illinois: Fulton Co. -90.0568, 40.4583 at a distance of 2384 m
6. Science Hill School; Illinois: Fulton Co. -90.0868, 40.4947, ( 642 ft ) at a distance of 2559 m
7. Evelen Branch mouth; Illinois: Fulton Co. -90.1115, 40.4719 at a distance of 2878 m
8. Saint David; Illinois: Fulton Co. -90.0487, 40.4933, ( 630 ft ) at a distance of 3347 m
9. Sludge Pond Number 1-3A Berm Dam; Illinois: Fulton Co. -90.1084, 40.4933 at a distance of 3469 m
10. Sludge Pond Number 1-3A; Illinois: Fulton Co. -90.1084, 40.4933 at a distance of 3469 m

The 7.5 minute series topographic maps for that area