B ardsey , an island a mile and three-quarters long, and covering approximately an area of 500 acres, is the westernmost fragment of North Wales, and lies about 2 miles from the promontory of the Lleyn (Western Carnarvonshire), from which it is separated by Bardsey Sound. Its Welsh name, Ynys Enlli, or the Island of the Current, has reference to the strong tides that sweep between its shore and the mainland. Mynydd Enlli, the dominant topographical feature of Bardsey, lies in the north-east of the island, and forms a bold ridge running nearly due north and south. It rises precipitously above the eastern line of sea-cliffs to a height of 548 feet O.D., and descends more gradually on its western side to about 100 feet O.D., where it passes into cultivated drift-covered ground. At the harbour of Henllwyn, the larger and northern part of the island in which this ‘mountain’ is situated is connected by an isthmus, at its narrowest some 35 yards wide, with the smaller southern portion, which consists of a rather flat tract having an elevation of about 50 to 60 feet O.D.; on this portion the lighthouse is built. The southern extremity has been so much dissected by sea-erosion, that the strip of slates between the heads of the opposing inlets of Ogof Lladron and Ogof Diban is only 40 feet wide. Geologically, Bardsey has long been recognized as forming the isolated extremity of the 18-mile-long strip of ancient rocks that borders the western coast of the Lleyn
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