The Cliffs of Moher (; ) are sea cliffs located at the southwestern edge of the Burren region in County Clare, Ireland. They run for about . At their southern end, they rise above the Atlantic Ocean at Hag's Head, and, to the north, they reach their maximum height of just north of O'Brien's Tower, a round stone tower near the midpoint of the cliffs, built in 1835 by Sir Cornelius O'Brien, then continue at lower heights. The closest settlements are the villages of Liscannor to the south, and Doolin to the north.