|Native name: Ynys Dewi|
Ramsey Island viewed from St David's Head
|Location||St Brides Bay|
|Length||3.2 km (1.99 mi)|
|Highest elevation||136 m (446 ft)|
|Ethnic groups||Welsh people|
Ramsey Island (Welsh: Ynys Dewi) is an island about 1 kilometre (0.62 miles) off St David's Head in Pembrokeshire on the northern side of St Brides Bay, in southwest Wales. It is 259 hectares (640 acres) in area.
Ramsey Island is less than 3.2 km (2 mi) long and its highest point is 136 metres (446 ft) above sea level at Carnllundain, and is listed as a HuMP. It is the fourth largest island in Wales, after Anglesey, Holy Island and Skomer.
The island has a diverse geology for a relatively small area; it comprises sedimentary, volcanic and intrusive igneous rocks dating from the early Palaeozoic Era. The larger part of the north of the island is formed from mudstones of the Tetragraptus Mudstone Formation (also known as the 'Penmaen Dewi Shale Formation' and again as the 'Road Uchaf Formation' (sic) after the Rhod Uchaf locality on the island's east coast). However Carnysgubor stands proud to their west as it is formed from a more resistant microtonalite intrusion. In contrast the coastal cliffs between Trwyn-drain-du and Trwyn-Sion-Owen and also between Trwyn Ogof Hen and Rhod Uchaf are formed by sedimentary rocks, the mica-rich Lingula Flags and the sandstones and mudstones of the Ogof Hen Formation. The rock strata are typically steeply tilted and commonly faulted.
Running NW–SE across the centre of the island from Aber Mawr to the vicinity of The Bitches is a band of late Arenig age tuffs and 'pencil slates' assigned to the Abermawr Formation. Its boundary with the sediments to the north is a fault.
The south of the island is dominated by a rhyolite intrusion as are the islets off its southern coast. To the west of the Ramsey Fault which runs from Aber Mawr to Porth Lleuog, is Carnllundain which is formed from the tough rhyolitic tuffs of the Carn Llundain Formation. These tuffs arose as volcanic ash falls, ash flows and turbidite deposits. Smaller areas of dark grey mudstones interbedded with debris flows grouped together as the Porth Llauog Formation occur around the margins of the rhyolite. Part of the southern margin of the inlet of Aber Mawr is characterised by the mudstones and sandstones of the Trwyn Llundain Formation, a part of the Solva Group of Cambrian rocks.
Surveys in the 1990s and more recently have found evidence of prehistoric cairns, field systems, barrows and other anomalies which suggest human activity on the island dates back up to 5,000 years. Mediaeval sites include a holy well and cemetery from the 9th century.
From 1082, the island was part of the cantref of Dewisland under the control of the bishops of St David's. In the 12th century, it was a place of pilgrimage. In the 13th century, the island was reported to be fertile, producing beef, sheep and goats, and wheat, barley and oats. In the 14th century, 100 acres of the island supported horses, cattle and sheep, and rabbits, rushes, heath and birds' eggs were harvested. A farmhouse, corn mill and lime kiln were recorded in the 16th century, but the farm building was a ruin by the early 19th century. The mill and kiln were in operation until the early 20th century, and in 1905 the island was sold into private hands and ceased being an ecclesiastical holding. A new farmhouse was built early in the 19th century, and was Grade II listed by Cadw in 1992.
Owned and managed by the Royal Society for the Protection of Birds (RSPB), the island has spectacular bird cliffs, coastal scenery and heathland. It is one of the best sites in Wales to see choughs, which are attracted by an ample supply of dung beetles.
Ramsey has the most important grey seal breeding colony in southern Britain, with over 400 seal pups born each autumn. In October 2017 the remnant storm of hurricane Ophelia was responsible for some 90 seal pup deaths.
With a permanent population of just two human residents, the Royal Society for the Protection of Birds (RSPB) Warden and Assistant Warden who live in a farmhouse there, the island is otherwise uninhabited. Tourist boats sail around the island and a ferry service run by Thousand Islands Expeditions operates from Easter-31 October from Saint Justinian's RNLI lifeboat station on the mainland.
Nearby islands and rocks
Ramsey Island is surrounded by a number of smaller islands, islets and rock clusters, including:
- The Bitches rocks and tidal race
- The Bishops and Clerks group, including:
- Carreg Rhoson and Maen Rhoson
- Daufraich and Maen Daufraich
- Emsger or South Bishop (37 metres, 121 feet)
- Llechau-isaf and Llechau-uchaf
- North Bishop (44 metres, 144 feet)
- Meini Duon (Black Rocks)
- Ynys Bery (71 metres, 233 feet)
- Ynys Cantwr (tidal island; 54 metres, 177 feet)
- Ynys Eilun and Pont yr Eilun
- Ynys Gwelltog (Grassy Island; 56 metres, 184 feet)
The waters around the island have significant tidal effects, and tidal waterfalls occur between The Bitches. The asymmetrical underwater flow can be 3.8 m/s (12.5 ft/s) northward (flood) and 1.9 m/s (6.2 ft/s) southward (ebb), with some turbulence. The sound reaches some 66 metres (217 feet) deep, although a tidal island called Horse Rock protrudes from the water at low tide.
- The Rough Guide to Wales, Rough Guides, Rough Guide Travel Guides, Mike Parker, Paul Whitfield, 4, illustrated, Rough Guides, 2003, ISBN 1-84353-120-8, ISBN 978-1-84353-120-3, pg. 194
- British Geological Survey 1992 1:50,000 scale provisional geological map sheet 209 (England and Wales) St David's
- Howells, M.F. 2007 British Regional Geology: Wales (Keyworth, Nottingham, British Geological Survey) pp 45–51
- "Ramsey Island: New survey finds 'Bronze Age' site". BBC News. 26 March 2018. Retrieved 27 March 2018.
- "Dyfed Archaeological Trust: Ramsey". Retrieved 27 March 2018.
- "British Listed Buildings: The Farmhouse, Ramsey Island". Retrieved 27 March 2018.
- Countryside Council for Wales, National Nature Reserves|Ramsey Archived 26 November 2010 at the Wayback Machine. (retrieved 2011-10-28).
- "About 90 Ramsey Island seal pups lost to Storm Ophelia". BBC News. 18 October 2017. Retrieved 25 October 2017.
- "The Bitches". the-bitches.co.uk.
- -. "Bitches tidal rapid - South - Wales - Rivers - The UK Rivers Guidebook". ukriversguidebook.co.uk.
- "Canoe Wales -". canoewales.com.
- "Bitches and Tides"
- Evans, Paul Stephen (2014). Hydrodynamic characteristics of macrotidal straits and implications for tidal stream turbine deployment pages 107-109, 169. PhD Thesis, Cardiff University
- Macalister, Terry. "Tidal power firm signs deal to sell electricity to EDF Energy" The Guardian, 25 September 2014.
- , Ellie. "First full-scale tidal generator in Wales unveiled: Deltastream array to power 10,000 homes using ebb and flow of the ocean" Daily Mail, 7 August 2014.
- Chris Kelsey (17 June 2015). "DeltaStream tidal energy device further delayed as company seeks new funding". walesonline.
- "Tidal Energy Ltd » Talking Tides: Martin Murphy of Tidal Energy". tidalenergyltd.com.
- "Turbine design turns the tide for renewables". eurekamagazine.co.uk.
- "Giant tidal turbine placed on seabed off Pembrokeshire". BBC. 14 December 2015. Retrieved 14 December 2015.
|Wikimedia Commons has media related to Ramsey Island.|
- RSPB website
- RSPB ferry to Ramsey Island
- Ramsey Island RSPB Nature Reserve
- JNCC description – includes map of GB showing location
- Guided Geology Walks on Ramsey Island
- for Ramsey Island