Grotte de Poul Brenn (Poul Brenn cave) is located south to L'Arche de Porh Grouez
on Cote Sauvage in Belle-Ile-en-Mer island, Morbihan department of France. To visit the arch by land, a rope and a minus low tide is recommanded. The natural arches of Cote Sauvage are index-linked here from north to south. IGN topographic map Top 25 number 0822 wet Belle-Ile pleat D4.