Forte da Baralha
Also known as: Baralha Fort
A boat-accessed rock reef off Sesimbra, mixed sand and rock from about 12 to 18m, known for camouflaged reef life and sand-dwelling fish.
Last updated September 2026
The dive
The boat drops divers onto a rock that climbs from around 15 metres to just short of the surface. Divers hold the shallower band, 12 to 18 metres, working the rock's crevices for nudibranchs and scorpionfish, or continue down to a sandy floor around 22 to 24 metres, where a different set of animals sits out in the open instead of hiding in the rock: sole, turbot and flounder among them. The two terrains on one profile are the point of the dive: a diver who wants the full range works both zones inside a single tank.
What makes it special
Forte da Baralha takes its name from the ruined Fort Sao Domingos da Baralha just onshore, a seventeenth-century coastal defence position, abandoned now but still walkable as a stop on the coastal hiking route. Small, camouflaged animals hold the rock, and a separate cast of species works the adjoining sand. An ocean sunfish passes by on lucky days, a genuine but occasional bonus alongside the camouflage-hunting the dive is built around.
Photographer's notes
Hermit crabs and starfish round out the rock-and-sand cast, and red mullet work the open sand where the rock's camouflage specialists do not need to hide. John Dory and seabream pass through the same ground for anyone working wider than macro.
Know before you go
Water at the site runs a documented 16 to 20 degrees Celsius. Every dive here starts on a boat out of Sesimbra harbour.
Why Dive Forte da Baralha
What makes this dive site stand out.
- Two habitats one dive
Rocky formations and a sandy floor let divers work both terrains on one dive
- Named for the fort
Sits just offshore from the ruined Fort Sao Domingos da Baralha onshore
- Camouflaged reef life
Nudibranchs, scorpionfish and hermit crabs work the rock sections
- Sand-zone species
Sole, turbot and flounder favour the sandy zone around 22-24m
- Depth-graded certification
Rock top holds to about 18m; the deeper sand option calls for Advanced Open Water
Depth & Profile
Location
38.4130°N, 9.1893°W
Conditions & difficulty
Area-wide framing, not a site-specific finding: May-October runs warmer and busier, January-February gives the clearest water
Both published sources mark the whole site Open Water-suitable; the deeper 22-24m sand option runs past the 18-metre depth limit of Open Water certification, so Advanced Open Water is the safer-graded minimum for that profile
Two independent per-site sources both mark the shallow rock-top option Open Water-suitable
Marine Life
Rules and permits
Frequently Asked Questions
Is Forte da Baralha the same site as Arcanzil?▾
No. They are two separate rock formations, about 735 metres apart along the same stretch of coast toward Cabo Espichel. Both are described as a rock rising from around 15 metres toward the surface, which is why the two are sometimes taken for one site, but they are distinct dives.
Why do depth figures for Forte da Baralha range from 12 to 24 metres?▾
The rock's own operator page gives a single 18-metre figure; a separate catalogue page for the same site gives an average of 12 metres and a maximum of 24, with some accounts describing dives starting as deep as 22 metres on the sandy zone beyond the rock. Both are published as Open Water-suitable, but the deeper 22-24 metre option sits above where Open Water training normally stops, so treat Advanced Open Water as the safer-graded minimum if that is the profile you are booking.
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