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) = -89.7820, 40.2978; 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. Red Oak Ridge; Illinois: Mason Co. -89.7820, 40.2978 at a distance of 5 m
2. Red Oak Ditch; Illinois: Mason Co. -89.7704, 40.2944 at a distance of 1053 m
3. Brown School; Illinois: Mason Co. -89.7868, 40.3175 at a distance of 2230 m
4. McFadden Ditch; Illinois: Mason Co. -89.7598, 40.2850 at a distance of 2360 m
5. Golden Valley School; Illinois: Mason Co. -89.7534, 40.2900, ( 510 ft ) at a distance of 2579 m
6. Red Oak School; Illinois: Mason Co. -89.8107, 40.2831 at a distance of 2934 m
7. Pennsylvania, Township of; Illinois: Mason Co. -89.7657, 40.2725 at a distance of 3128 m
8. White and Brown Ditch; Illinois: Mason Co. -89.7862, 40.3297 at a distance of 3565 m
9. White School; Illinois: Mason Co. -89.7829, 40.3319 at a distance of 3792 m
10. Allen Grove Ditch; Illinois: Mason Co. -89.7329, 40.3039 at a distance of 4229 m

The 7.5 minute series topographic maps for that area