| Site of Special Scientific Interest | |
![]() Location of Penn's Rocks. | |
| Area of search | East Sussex |
|---|---|
| Grid reference | TQ 521 348 |
| Interest | Biological |
| Area | 10.2 hectares (25 acres) |
| Notification date | 1985 |
| Location map | Magic Map |
Penn's Rocks is a 10.2-hectare (25-acre) biological Site of Special Scientific Interest north of Crowborough in East Sussex.
This site is a steep sided valley on sandstone with many mosses and liverworts, which is a nationally rare habitat. Uncommon species include Orthodontium gracile, Bazzania trilobata, Saccogyna viticulosa and Harpanthus scutatus.
This site is in four separate areas. A footpath runs through one of them but the others are private land.