The selected location is:

The elevation is 144 m ( 472 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) = -90.0851, 40.2472; 144 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. Lakewood; Illinois: Mason Co. -90.0851, 40.2472 at a distance of 5 m
2. White Oak School; Illinois: Mason Co. -90.0854, 40.2556 at a distance of 938 m
3. White Oak Creek mouth; Illinois: Mason Co. -90.0957, 40.2561 at a distance of 1342 m
4. Matanzas Beach; Illinois: Mason Co. -90.1040, 40.2431 at a distance of 1671 m
5. Matanzas Lake; Illinois: Mason Co. -90.1057, 40.2453 at a distance of 1767 m
6. Matanzas Island; Illinois: Mason Co. -90.1032, 40.2550 at a distance of 1771 m
7. Deep Slough; Illinois: Mason Co. -90.0907, 40.2628 at a distance of 1801 m
8. Speckman Cemetery; Illinois: Mason Co. -90.0815, 40.2642 at a distance of 1917 m
9. Matanzas School (historical); Illinois: Mason Co. -90.0993, 40.2311 at a distance of 2154 m
10. Matanzas; Illinois: Mason Co. -90.0995, 40.2311, ( 465 ft ) at a distance of 2164 m

The 7.5 minute series topographic maps for that area