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Ortac is a small uninhabited islet about 5 km west of the coast of Alderney near to the islet of Burhou. It measures roughly 50 by 70 meters, and rises 24 meters (79 feet) above the sea level.〔(Channel Islands Pilot ), page 48〕 A.H. Ewen surmised that the rock's name meant "large rock at the edge" from the Norman language ''or'' (edge) + ''etac'' (stack). Alexander Deschamps said that the French formerly knew it as "the Eagle's Nest". ==Geology== Ortac and Alderney, along with the Casquets, are part of the same sandstone ridge. Paul Naftel, a Guernsey artist, sketched it, and the drawing appeared in Ansted & Latham's book, ''The Channel Islands'' (1862). The writers themselves commented - If the sea bottom, which is in very few parts as much as 20 fathoms deep, were elevated , the island of Alderney, the Burhou and Ortac group, and the Casquets would be connected by low land, and form a narrow island around long. The 1906 book, ''The Channel Pilot'' states – Between Ortac, Verte Tête and Burhou Island, are scattered many dangerous rocks, and ledges among which the streams run with great velocity. It also supposedly contains a cave known as "the Oven". 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「Ortac」の詳細全文を読む スポンサード リンク
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