The selected location is:

The elevation is 151 m ( 495 ft )
The gradient is: 0.0 percent
There is no aspect direction.
The local roughness is: 0.3 or slight
The location as decimal degrees (X,Y;Z) = -90.0437, 40.2436; 151 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. Kelsey; Illinois: Mason Co. -90.0437, 40.2436 at a distance of 5 m
2. Mid-State Dragway; Illinois: Mason Co. -90.0546, 40.2353 at a distance of 1305 m
3. Bowman School; Illinois: Mason Co. -90.0376, 40.2606, ( 491 ft ) at a distance of 1962 m
4. White Oak Creek head; -90.0429, 40.2242 at a distance of 2150 m
5. Johnson Landing Strip; Illinois: Mason Co. -90.0418, 40.2217 at a distance of 2432 m
6. Long Branch; Illinois: Mason Co. -90.0379, 40.2172, ( 487 ft ) at a distance of 2967 m
7. Havana Regional Airport; Illinois: Mason Co. -90.0229, 40.2211, ( 499 ft ) at a distance of 3057 m
8. Lakewood; Illinois: Mason Co. -90.0851, 40.2472 at a distance of 3547 m
9. White Oak School; Illinois: Mason Co. -90.0854, 40.2556 at a distance of 3792 m
10. Negro Lake; Illinois: Mason Co. -90.0337, 40.2778 at a distance of 3896 m

The 7.5 minute series topographic maps for that area