The selected location is:

The elevation is 131 m ( 430 ft )
The gradient is: 0.2 percent
The aspect direction is: 180.0 degrees or S
The local roughness is: 0.3 or slight
The location as decimal degrees (X,Y;Z) = -90.0957, 40.2561; 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. White Oak Creek mouth; Illinois: Mason Co. -90.0957, 40.2561 at a distance of 5 m
2. Matanzas Island; Illinois: Mason Co. -90.1032, 40.2550 at a distance of 650 m
3. Deep Slough; Illinois: Mason Co. -90.0907, 40.2628 at a distance of 860 m
4. White Oak School; Illinois: Mason Co. -90.0854, 40.2556 at a distance of 877 m
5. Lakewood; Illinois: Mason Co. -90.0851, 40.2472 at a distance of 1334 m
6. Matanzas Lake; Illinois: Mason Co. -90.1057, 40.2453 at a distance of 1467 m
7. Speckman Cemetery; Illinois: Mason Co. -90.0815, 40.2642 at a distance of 1508 m
8. Matanzas Beach; Illinois: Mason Co. -90.1040, 40.2431 at a distance of 1603 m
9. Lange Pond; Illinois: Mason Co. -90.0854, 40.2733 at a distance of 2105 m
10. Langellier School; Illinois: Fulton Co. -90.1237, 40.2650, ( 433 ft ) at a distance of 2582 m

The 7.5 minute series topographic maps for that area