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: 0.0 or flat
The location as decimal degrees (X,Y;Z) = -90.1554, 40.2047; 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. Grass Lake; Illinois: Mason Co. -90.1554, 40.2047 at a distance of 5 m
2. Grand Island; Illinois: Mason Co. -90.1468, 40.2014 at a distance of 815 m
3. Bell Lake; Illinois: Mason Co. -90.1668, 40.2072 at a distance of 1013 m
4. East Branch Illinois River; Illinois: Mason Co. -90.1540, 40.1917 at a distance of 1443 m
5. Otter Creek mouth; Illinois: Fulton Co. -90.1645, 40.2164 at a distance of 1518 m
6. West Point Landing; Illinois: Fulton Co. -90.1704, 40.2136, ( 441 ft ) at a distance of 1619 m
7. Bath; Illinois: Mason Co. -90.1409, 40.1933, ( 462 ft ) at a distance of 1764 m
8. Bath Lake; Illinois: Mason Co. -90.1320, 40.2069 at a distance of 2006 m
9. Lakewood Golf Course; Illinois: Mason Co. -90.1290, 40.2083 at a distance of 2282 m
10. Moscow Lake; Illinois: Mason Co. -90.1607, 40.1825 at a distance of 2501 m

The 7.5 minute series topographic maps for that area