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In page Achill Island:

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The cliffs of Croaghaun at the western end of the island are the third-highest sea cliffs in Europe but are inaccessible by road. Near the westernmost point of Achill, Achill Head, is Keem Bay. Keel Beach is visited by tourists and used as a surfing location.[citation needed] South of Keem Beach is Moytoge Head, which, with its rounded appearance, drops dramatically down to the ocean. An old British observation post, built during World War I to prevent the Germans from landing arms for the Irish Republican Army, still stands on Moytoge. During the Emergency (WWII), this post was rebuilt by the Irish Defence Forces as a lookout post for the Coast Watching Service wing of the Defence Forces. It operated from 1939 to 1945.[1]