The Cliffs of Moher (Irish: Aillte an Mhothair) are located at the southwestern edge of the Burren region in County Clare, Ireland. They rise 120 metres (390 ft) above the Atlantic Ocean at Hag's Head, and reach their maximum height of 214 metres (702 ft) just north of O'Brien's Tower, eight kilometres to the north. The cliffs receive almost one million visitors a year.

O'Brien's Tower is a round stone tower near the midpoint of the cliffs built in 1835 by Sir Cornelius O'Brien to impress female visitors. From the cliffs and from atop the watchtower, 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.