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) = -90.1829, 40.1756; 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. Jack Lake; Illinois: Mason Co. -90.1829, 40.1756 at a distance of 5 m
2. Wilson Creek mouth; Illinois: Fulton Co. -90.2018, 40.1778 at a distance of 1631 m
3. Swan Lake; Illinois: Mason Co. -90.1779, 40.1900 at a distance of 1659 m
4. Holmes Landing; Illinois: Schuyler Co. -90.2029, 40.1769, ( 435 ft ) at a distance of 1712 m
5. Patterson Bay; Illinois: Mason Co. -90.1837, 40.1600 at a distance of 1728 m
6. Moscow Lake; Illinois: Mason Co. -90.1607, 40.1825 at a distance of 2040 m
7. Curtis Lake; Illinois: Mason Co. -90.1984, 40.1589 at a distance of 2273 m
8. Anderson Lake; Illinois: Fulton Co. -90.1848, 40.1997 at a distance of 2686 m
9. Patterson School; Illinois: Mason Co. -90.1801, 40.1500, ( 457 ft ) at a distance of 2847 m
10. East Branch Illinois River; Illinois: Mason Co. -90.1540, 40.1917 at a distance of 3044 m

The 7.5 minute series topographic maps for that area