O'Brien's Tower and the Cliffs of Moher - Patryk Kosmider/Shutterstock The western shore of Ireland's County Clare ends in a ragged, 8-mile stretch of coastline that looks as if some giant sea monster has taken a bite out of it. An expanse of pool-table-felt green ends in a scalloped wall of golden limestone cliffs that, from an aerial view, look a lot like tooth marks. These are the Cliffs of Moher, which fall 700 feet straight down into the roiling Atlantic Ocean.