Lewis and Harris MacLeod, and those on Lewis being referred to as from the clan MacLeod of Lewis. Lewis is also the ancestral home of Clan Morrison. The Lewis chessmen is a famous collection of 12th-century chess pieces, carved from walrus ivory and mostly in the form of human figures, which were discovered in Uig in 1831. A major industry on the island is the production of Harris tweed fabric, which is handmade on the island; by law only fabric produced in the Outer Hebrides can be called Harris tweed. The Lewis Trilogy of novels ("The Blackhouse", "The Lewis Man" and "The Chessmen")
Donegal Bay Ireland's largest bay, and also contains Ulster's highest (and Europe's sixth-highest) sea cliffs at Slieve League, which tower 1972 ft (601 m) above sea level. Donegal Bay's beaches have some of Europe's finest surfing, caused by a combination by a direct west-facing location and the funnel-shape of Donegal Bay (the westerlies of the Atlantic Ocean get funnelled into a relatively small area, which increases the size of the swell). Rossnowlagh and Bundoran are recognised by the European surfing community as among Ireland's finest surf beaches with good facilities and excellent water quality. Donegal Bay Donegal Bay ("Bá Dhún na nGall"