St Catherine's Island
| St Catherine's Island | ||
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| Waters | Carmarthen Bay | |
| Geographical location | 51 ° 40 ′ 14 ″ N , 4 ° 41 ′ 30 ″ W | |
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| length | 200 m | |
| width | 60 m | |
| surface | 1 ha | |
| Highest elevation | 34 m | |
St Catherine's Island ( Welsh : Ynys Catrin ) is a small island near the town of Tenby in Pembrokeshire , Wales . The island can be reached on foot via a beach at low tide. A fortress was built on the island in 1869 to prevent attacks towards Pembroke Dock .
The third episode of the fourth season of the BBC series Sherlock , The Final Problem , was filmed largely on the island. The fortress subsequently served as a maximum security prison.
Individual evidence
- ↑ Kathryn Williams, Joshua Knapman: Revealed: Sherlock's Sherrinford is Tenby landmark St Catherine's. Retrieved February 14, 2017 .