The selected location is:

The elevation is 155 m ( 509 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) = -89.7868, 40.3175; 155 m

The state and county are Illinois: Mason County 17125
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. Brown School; Illinois: Mason Co. -89.7868, 40.3175 at a distance of 5 m
2. White and Brown Ditch; Illinois: Mason Co. -89.7862, 40.3297 at a distance of 1360 m
3. White School; Illinois: Mason Co. -89.7829, 40.3319 at a distance of 1637 m
4. Red Oak Ridge; Illinois: Mason Co. -89.7820, 40.2978 at a distance of 2221 m
5. Pleasant Hill Cemetery; Illinois: Mason Co. -89.8129, 40.3336 at a distance of 2853 m
6. Red Oak Ditch; Illinois: Mason Co. -89.7704, 40.2944 at a distance of 2915 m
7. Union School Number 1; Illinois: Mason Co. -89.8284, 40.3183, ( 499 ft ) at a distance of 3539 m
8. White and Rowley Ditch; Illinois: Mason Co. -89.8037, 40.3469 at a distance of 3571 m
9. Forest City, Township of; Illinois: Mason Co. -89.8193, 40.3397 at a distance of 3706 m
10. Kreilings Airport; Illinois: Mason Co. -89.7873, 40.3533, ( 502 ft ) at a distance of 3980 m

The 7.5 minute series topographic maps for that area