Caves
US - Union County
| Name | Length | Depth |
|---|---|---|
| Dale's Cave | 154 m | 0 m |
| Winfield Cave | 137 m | 3 m |
| Mifflinburg Caves | 30 m | 0 m |
| Cave Spring Cave | 0 m | |
| Cobden Cave | 0 m | |
| Cricket Cave | 0 m | |
| Friendship School Cave | 0 m | |
| Guthrie Cave | 0 m | |
| Lilly Cave | 0 m | |
| Quarry Cave | 0 m | |
| Rich's Cave | 0 m | |
| Roaring Spring Cave | 0 m | |
| Saratoga Cave | 0 m | |
| Sensemeyer Cave | 0 m | |
| Union Point Cave | 0 m | |
| Mreps Cave | 0 m | |
| Feltville Mine | 0 m |