The Cliffs of Moher () are located at the southwestern edge of the Burren region in County Clare, Ireland. They rise above the Atlantic Ocean at Hag’s Head, and reach their maximum height of just north of O’Brien’s Tower, eight kilometres to the north. The tower is a round stone tower near the midpoint of the cliffs built in 1835 by Sir Cornelius O’Brien. From the cliffs and from atop the tower, visitors can see the Aran Islands in Galway Bay, the Maumturks and Twelve Pins mountain ranges to the north in County Galway, and Loop Head to the south. The cliffs rank amongst the top visited tourist sites in Ireland, and receive almost one million visitors a year.