Sesimbra & the Arrábida

Diving here is a boat day from the Porto de Abrigo. The centres found in town — Mega Dive, Odisseia Azul, Arrábida Experiences and Dive Club Cipreia at the naval club — all work out of the harbour or the marina beside it, and the run west along the Arrábida coast is short: Pedra da Mula, beside Ribeira do Cavalo beach, is under ten minutes out. A few spots can be entered from the beach instead of the boat, Baleeira among them. Sites that carry a Sesimbra label but lie 10 km or more north, off Fonte da Telha, are a different stretch of coast and a longer run.

The seabed is rock rather than coral. Shelf-shaped slabs stack into ledges, a rock at Forte da Baralha rises from 15 m to the surface, and canyons cut through with walls of yellow sponge, anemones and nudibranchs at Ponta da Passagem. Gorgonians cover the bottom at Pedra da Milu thickly enough to read as a carpet, and caves open in places: Gruta dos Pampos has a wide mouth that splits in two, while Cavernas is a maze of holes with and without exits. Water runs 13–18°C and visibility swings from a couple of metres to about 15 m depending on month and site.

It suits divers based in or passing through Lisbon, anyone who wants the River Gurara, and technical divers with Barco das Telhas at 55–65 m and the current-swept rock of P-39 at 34–42 m on their list. Beginners have honest shallow options at Baleeira and Pedra do Meio. Divers after warm, clear water should look to the Algarve instead, and those wanting granite caves and a wilder crossing have Berlengas up the coast. Cabo Espichel takes Atlantic wind and swell year-round, so cancellations happen in any month.