The selected location is:

The elevation is 137 m ( 448 ft )
The gradient is: 1.3 percent
The aspect direction is: 129.8 degrees or SE
The local roughness is: 0.6 or slight
The location as decimal degrees (X,Y;Z) = -90.1801, 40.1500; 137 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. Patterson School; Illinois: Mason Co. -90.1801, 40.1500, ( 457 ft ) at a distance of 5 m
2. Patterson Bay; Illinois: Mason Co. -90.1837, 40.1600 at a distance of 1157 m
3. Curtis Lake; Illinois: Mason Co. -90.1984, 40.1589 at a distance of 1851 m
4. Devils Elbow; Illinois: Fulton Co. -90.2001, 40.1417 at a distance of 1937 m
5. Snicarte Island; Illinois: Mason Co. -90.2029, 40.1475 at a distance of 1963 m
6. Jack Lake; Illinois: Mason Co. -90.1829, 40.1756 at a distance of 2857 m
7. Mathew Bay; Illinois: Mason Co. -90.2090, 40.1311 at a distance of 3234 m
8. Snicarte Slough; Illinois: Mason Co. -90.2098, 40.1317 at a distance of 3244 m
9. Moscow Farm; Illinois: Mason Co. -90.1454, 40.1664 at a distance of 3473 m
10. Union School; Illinois: Mason Co. -90.1398, 40.1556 at a distance of 3488 m

The 7.5 minute series topographic maps for that area