Baía de São Martinho do Porto ( São Martinho do Porto) Alcobaça - Portugal

Set in an an almost perfectly scallop shaped bay, with twin headlands guarding the entrance to the Atlantic Ocean, the crescent of beach stretches from the mouth of the Tornada river to the town at the northern end. At the far end the beach is backed by extensive dunes becoming increasingly built up as you near the other.
The sea here is virtually always calm as the bay is very sheltered (the polar opposite to the neighbouring rival resort of Nazare). This makes it a popular haven for sailing and there are always plenty of boats of all sizes bobbing around in the lee of the headland. It also makes it a great choice for families and the beach is sometimes referred to as "Praia das Crianças" - children's beach.