Killarney National Park is in southwest Ireland close to the island's most westerly point. The Lakes of Killarney and the Mangerton, Torc, Shehy and Purple Mountains are in the park. Altitudes in the park range from to . A major geological boundary between Devonian Old Red Sandstone and Carboniferous limestone lies in the park. The underlying geology of the majority of the park is sandstone, with the limestone pavements occurring on the low eastern shore of Lough Leane.