It is a marine reserve and has been classified by the Council of Europe as a "Biosphere Reserve". The archipelago consists of a large island, Berlenga Grande, and some small granite islands and rocks (Estelas and Farilhões), which are situated some 7 miles off the headland of Cabo Carvoeiro to the north-west of Peniche.

The island of Berlenga Grande can be seen from the mainland when there is no sea mist. Here you will find endemic species of flora, as well as one of the preferred nesting sites for sea birds.

Built on a rock adjacent to the Berlenga island and connected to it by a small bridge, there stands the Forte de São João Baptista, a Manueline military fortress built in 1502.

The island’s tiny beaches with their clear blue sea are very beautiful and ideal for swimming and diving.

Access to the island is by boat, with departures from Peniche harbour. It takes roughly 30 minutes to reach Berlenga Grande. You can return in the evening or spend the night at the fortress. There is also a restaurant on the island.