Inishmore is one of western Ireland's Aran Islands. It sits at the mouth of Galway Bay and is known for ancient sites, like the prehistoric, clifftop fort Dún Aonghasa. Nearby is the Worm Hole, a rectangular natural pool. The medieval Christian ruins of the Seven Churches are in the northwest. Clochán na Carraige is a stone structure with a beehive roof. Kilmurvey Beach is known for birdlife and a nearby seal colony.