Yes, you can swim at the Aran Islands, and they offer some of the most pristine and bracing Atlantic waters in Ireland. On Inis Mór (the largest island), Kilmurvey Beach is a designated "Blue Flag" beach, which means it meets high environmental and safety standards; it has white sand, clear turquoise water, and lifeguards on duty during the peak summer months. It is very safe for families due to its sheltered position. Another famous, though much more adventurous, spot is Poll na bPéist (The Worm Hole), a naturally formed rectangular pool in the limestone cliffs where the Red Bull Cliff Diving World Series is often held. However, swimming there is only for the very experienced and should only be attempted when the sea is perfectly calm, as rogue waves can be extremely dangerous. On the smaller islands, Inis Meáin and Inis Oírr also have beautiful, quiet sandy beaches. Prospective swimmers should be aware that even in summer, the water temperature rarely exceeds 16°C (61°F), so a wetsuit is often recommended for longer swims.