The Cliffs of Moher are one of Ireland's most recognisable natural landmarks: the sea cliffs run for about 14 kilometres along the Atlantic coast and reach their highest point, over 200 metres, near O'Brien's Tower, a lookout tower built in 1835. The cliffs are made up of layers of shale and sandstone laid down in an ancient river delta more than 300 million years ago. Tens of thousands of seabirds, including puffins, nest on the ledges, and on a clear day the view stretches to the Aran Islands in Galway Bay.
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