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: 0.3 or slight
The location as decimal degrees (X,Y;Z) = -90.1057, 40.2453; 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. Matanzas Lake; Illinois: Mason Co. -90.1057, 40.2453 at a distance of 5 m
2. Matanzas Beach; Illinois: Mason Co. -90.1040, 40.2431 at a distance of 279 m
3. Matanzas Island; Illinois: Mason Co. -90.1032, 40.2550 at a distance of 1102 m
4. White Oak Creek mouth; Illinois: Mason Co. -90.0957, 40.2561 at a distance of 1473 m
5. Matanzas; Illinois: Mason Co. -90.0995, 40.2311, ( 465 ft ) at a distance of 1658 m
6. Matanzas School (historical); Illinois: Mason Co. -90.0993, 40.2311 at a distance of 1663 m
7. Lakewood; Illinois: Mason Co. -90.0851, 40.2472 at a distance of 1765 m
8. White Oak School; Illinois: Mason Co. -90.0854, 40.2556 at a distance of 2073 m
9. Deep Slough; Illinois: Mason Co. -90.0907, 40.2628 at a distance of 2328 m
10. Langellier School; Illinois: Fulton Co. -90.1237, 40.2650, ( 433 ft ) at a distance of 2675 m

The 7.5 minute series topographic maps for that area