Also known as the Concha, the bay of São Martinho do Porto arose with the progressive silting up of the old lagoon, and is nowadays a beach of distinctive beauty in the shape of a conch. The Atlantic Ocean flows between the hills of Farol and Sant'Ana.
During the 12th century, Alfeizerão, which is right next door, was an important maritime port.
Today it is a place of family promenade, par excellence, with a waterfront that runs along the entire beach. The area is very lively during the bathing season.