The selected location is:

The elevation is 131 m ( 430 ft )
The gradient is: 0.0 percent
There is no aspect direction.
The local roughness is: 1.4 or average
The location as decimal degrees (X,Y;Z) = -90.0004, 40.3667; 131 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 Interior River Lowland (less typical) 72
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Nearby named places (in order by distance)

1. Chautaugua National Wildlife Refuge; Illinois: Mason Co. -90.0004, 40.3667 at a distance of 5 m
2. Chautauqua, Lake; Illinois: Mason Co. -89.9959, 40.3714 at a distance of 650 m
3. Buzzville; Illinois: Mason Co. -89.9904, 40.3661, ( 491 ft ) at a distance of 850 m
4. Christian Church; Illinois: Mason Co. -89.9882, 40.3497, ( 472 ft ) at a distance of 2149 m
5. Liverpool Lake; Illinois: Mason Co. -89.9943, 40.3875 at a distance of 2371 m
6. Quiver School; Illinois: Mason Co. -89.9976, 40.3450 at a distance of 2416 m
7. Quiver Creek mouth; Illinois: Mason Co. -90.0234, 40.3531 at a distance of 2468 m
8. Chautauqua National Migratory Waterfowl Refuge; Illinois: Mason Co. -90.0287, 40.3611 at a distance of 2483 m
9. McHarry Pond; Illinois: Mason Co. -89.9929, 40.3433 at a distance of 2670 m
10. Liverpool; Illinois: Fulton Co. -90.0009, 40.3917 at a distance of 2781 m

The 7.5 minute series topographic maps for that area