ALG-50. "Hole on the Sea Arch" is located on the northwest of the headland of Ponta da Piedade in Algarve province of Portugal. From the top of the cliff, this natural sea arch is out of view from any promontory but can be reached by ground if his location is know. However, a difficult passage about 2 meters steep is equipped with iron peg and rope in place which is used by fishermen for fishing from the arch.