The Cliffs of Moher (Irish: Aillte an Mhothair, "Cliffs of the ruin") are located at the south-western edge of The Burren area near Doolin, which is located in County Clare, Republic of Ireland.
The cliffs rise 120 m above the Atlantic Ocean at Hag's Head and extend for a distance of eight kilometers and to a height of 214 m.
O'Brien's Tower is a round stone tower at the rough midpoint of the cliffs. It was built by Sir Cornellius O'Brien in 1835 as an observation tower for the hundreds of tourists that frequented the cliffs even at that date. From atop that watchtower, one can view the Aran Islands and Galway Bay, across which lie the Maumturk Mountains in Connemara.
The cliffs are a significant tourist attraction, and there is a visitor center and parking lot on the site managed by Shannon Heritage, which also operates O'Brien's Tower. A largely unenclosed walking trail runs along the top edge of the entire length of the cliffs, skirting private grazing lands and often running within mere meters of a sheer dropoff into the ocean.
The Cliffs of Moher were filmed as the "Cliffs of Insanity" in the 1986 movie, The Princess Bride.
