Located on the southwestern edge of the Burren region in County Clare, Ireland, the Cliffs of Moher are sea cliffs that run for about 14 kilometers.
The cliffs rise 120 meters above the Atlantic ocean at their southern end at Hag's Head, and reach their maximum height at 214 meters north of O'Brien's Tower.
The Hag's Head is the name given to the most southern point of the cliffs because it looks like a woman's head looking out to sea. One legend states that an old hag named Mal of Malbay fell in love with an Irish hero, Cu Chulainn. Cu was chased across Ireland, and escaped by hopping across sea stacks as if they were stepping stones. Mal, however, lost her footing and was dashed against the cliff.
The cliffs consist mainly of Namurian shale and sandstone. The oldest rocks are at the bottom of the cliffs.
At peak season, it is possible to see approximately 30,000 pairs of birds living on the cliffs, representing more than 20 species. These include Atlantic puffins. Lots of sea life can be seen as well, including porpoises, dolphins, grey seals, whales, and sharks.
The Cliffs of Moher are a popular setting for filming, and have appeared in many popular movies including The Princess Bride and Harry Potter. They have also been featured in many music videos.