Known
natural feature
Venues
| Venue | Tags | |
|---|---|---|
| Dunstable Downs, Dunstable | natural feature | |
| Mallards Pike, Cinderford | natural feature | |
| Edgbaston Reservoir, Birmingham | natural feature | |
| Forfar Loch, Forfar | natural feature | |
| Thonock Lane Farm, Gainsborough | natural feature | |