The Cliffs of Moher are Ireland's most visited natural attraction with a magical vista that captures the hearts of up to one million visitors every year. Standing 702 feet at their highest point, they stretch for 8 kilometers (5 miles) along the Atlantic coast of County Clare in the west of Ireland.

The cliffs consist mainly of beds of Namurian shale and sandstone, with the oldest rocks being found at the bottom of the cliffs. It is possible to see 300 million year old river channels cutting through, forming unconformities at the base of the cliffs.

From atop the cliffs, 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. Thus, these locations are now considered very popular tourist sites and destinations in Ireland.

More Info: en.wikipedia.org