Treen Cliff
| Site of Special Scientific Interest | |
Pednvounder beach and Treen Cliff
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 Location within Cornwall
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| Area of Search | Cornwall |
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| Grid reference | SW395224 |
| Coordinates | 50°02′42″N 5°38′21″W / 50.0451°N 5.6392°WCoordinates: 50°02′42″N 5°38′21″W / 50.0451°N 5.6392°W |
| Interest | Biological |
| Area | 49.3 hectares (0.493 km2; 0.190 sq mi) |
| Notification | 1951 |
| Natural England website | |
Treen Cliff is a Site of Special Scientific Interest (SSSI) located on the Penwith Peninsula in Cornwall, England, UK, 6 miles (9.7 km) south-west of Penzance. First notified in 1951, with a revision in 1973, and a further notification on 1 July 1986, it is 49.3 hectares (122 acres) in area, stretching from grid reference SW387220 to SW402225. Designated for both for its biological and geological interest, part of the site, Treryn Dinas, is a Scheduled Ancient Monument consisting of a "cliff castle" with four ramparts and ditches and the Logan Rock. It is within the Cornwall Area of Outstanding Natural Beauty (AONB), the Penwith Heritage Coast and is part owned and managed by the National Trust.
The SSSI extends from Porthcurno beach in the west to Penberth Cove in the east. Several rare plant species occur and the site is of particular importance for its maritime heath. At the last site assessment on 12 August 2010, the SSSI was described as ″Unfavourable recovering″ because scrub and bracken Pteridium aquilinum encroachment are diminishing the interest, and the site needs to be grazed. Removal of sycamore Acer pseudoplatanus would enhance the site as well as the control of other invasive species. Maritime cliff habitat types, National Vegetation Classification, (NVC) MC1 and MC5 need to be added to the notifiable features.
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