The selected location is:

The elevation is 149 m ( 489 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) = -90.0229, 40.2211; 149 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. Havana Regional Airport; Illinois: Mason Co. -90.0229, 40.2211, ( 499 ft ) at a distance of 5 m
2. Long Branch; Illinois: Mason Co. -90.0379, 40.2172, ( 487 ft ) at a distance of 1348 m
3. Johnson Landing Strip; Illinois: Mason Co. -90.0418, 40.2217 at a distance of 1611 m
4. White Oak Creek head; -90.0429, 40.2242 at a distance of 1739 m
5. Peterville School (historical); Illinois: Mason Co. -89.9995, 40.2267 at a distance of 2087 m
6. Peterville Hall (historical); Illinois: Mason Co. -89.9973, 40.2322 at a distance of 2505 m
7. Kelsey; Illinois: Mason Co. -90.0437, 40.2436 at a distance of 3066 m
8. Mid-State Dragway; Illinois: Mason Co. -90.0546, 40.2353 at a distance of 3128 m
9. Jones School; Illinois: Mason Co. -90.0073, 40.1928 at a distance of 3407 m
10. Jones Cemetery; Illinois: Mason Co. -90.0057, 40.1892 at a distance of 3828 m

The 7.5 minute series topographic maps for that area