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) = -90.2001, 40.1417; 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. Devils Elbow; Illinois: Fulton Co. -90.2001, 40.1417 at a distance of 5 m
2. Snicarte Island; Illinois: Mason Co. -90.2029, 40.1475 at a distance of 692 m
3. Snicarte Slough; Illinois: Mason Co. -90.2098, 40.1317 at a distance of 1381 m
4. Mathew Bay; Illinois: Mason Co. -90.2090, 40.1311 at a distance of 1397 m
5. Curtis Lake; Illinois: Mason Co. -90.1984, 40.1589 at a distance of 1920 m
6. Patterson School; Illinois: Mason Co. -90.1801, 40.1500, ( 457 ft ) at a distance of 1939 m
7. Chain Lake; Illinois: Mason Co. -90.2232, 40.1419 at a distance of 1970 m
8. Patterson Bay; Illinois: Mason Co. -90.1837, 40.1600 at a distance of 2469 m
9. Howarth School; Illinois: Mason Co. -90.1990, 40.1147 at a distance of 2994 m
10. Snicarte; Illinois: Mason Co. -90.2315, 40.1233, ( 445 ft ) at a distance of 3365 m

The 7.5 minute series topographic maps for that area