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Grassholm ((ウェールズ語:Gwales) or ) is a small uninhabited island situated off the southwestern Pembrokeshire coast in Wales, lying west of Skomer. It is the westernmost point in Wales and is known for its huge colony of gannets. Grassholm has been owned since 1947 by the Royal Society for the Protection of Birds, and is one of its oldest reserves. It reaches 42 metres (138 feet). Grassholm National Nature Reserve is the third most important site for gannets in the world, after two sites in Scotland; St Kilda and Bass Rock. It serves as a breeding site for 39,000 pairs of the birds, and supports around 10 percent of the world population. The turbulent sea around Grassholm also provides good feeding ground for porpoises and bottlenose dolphins. Boats sail to Grassholm from St. Justinians lifeboat station and Martin's Haven on the mainland. Geologically, the island is largely formed from keratopyhre though the northwest coast and islet of West Tump are formed from basalt. A couple of NE-SW aligned faults cross the island. Raised beaches are present in places.〔British Geological Survey 1978 1:50,000 scale geological map sheet (England and Wales) 226/227 ''Milford'' (Keyworth, Notts)〕 Grassholm has been identified with ''Gwales'', an island featured in the ''Mabinogion''. In the Second Branch of the Mabinogi, Gwales is the site of a fabulous castle where the severed head of Bran the Blessed is kept miraculously alive for eighty years while his companions feast in blissful forgetfulness.〔(''The Mabinogi of Branwen'' ). From mabinogi.net. Retrieved 8 May 2009.〕〔''The Mabinogion:'' (Branwen the Daughter of Llyr ), translated by Lady Charlotte Guest. Online at (www.sacred-texts.com ).〕 On 15 July 1945, the cargo ship ran aground on Grassholm and sank. Nine crew were rescued by the Angle Lifeboat.〔(【引用サイトリンク】title=History )〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Grassholm」の詳細全文を読む スポンサード リンク
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