Bardsey Island, the legendary "Island of 20,000 saints", lies off the Llŷn Peninsula in the Welsh county of Gwynedd. The Welsh name means "The Island in the Currents", although its English name refers to the "Island of the Bards", or possibly the island of the Viking chieftain, "Barda".Bardsey is wide, long and in area. The north east rises steeply from the sea to a height of at Mynydd Enlli, which is a Marilyn, while the western plain is low and relatively flat cultivated farmland. To the south the island narrows to an isthmus, connecting to a peninsula on which the lighthouse stands. Since 1974 it has been included in the community of Aberdaron. It is the fourth largest offshore island in Wales.The island has been an important religious site since Saint Cadfan built a monastery in 516. In medieval times it was a major centre of pilgrimage and, by 1212, belonged to the Augustinian Canons Regular. The monastery was dissolved and its buildings demolished by Henry VIII in 1537, but the island remains an attraction for pilgrims to this day.Bardsey Island is now as famous for its wildlife and rugged scenery. A bird observatory was established in 1953, largely due to the island's position on important migration routes. It is of European importance, cited as a nesting place for Manx shearwaters and choughs, its rare plants, and habitats undisturbed by modern farming practices. It is one of the best places in Gwynedd to see grey seals, and the waters around the island attract dolphins and porpoises.