
Blue Ocean Divers
German-owned SSI/PADI dive centre at Luz Bay Club, Praia da Luz near Lagos, running shore and boat dives across the western Algarve since 1996.
Also known as: Ancora, Ancora reef, Ancoras
A limestone reef beside Ponta da Piedade, Lagos, where 17th-19th-century ships wedged anchors into the rock's holes; boat access, depth roughly 12-20 m.
Last updated September 2026
Ancoras sits a short boat trip out of Marina de Lagos, off the limestone headland of Ponta da Piedade. Holes, small passages and arches break up the reef in place of a flat wall or open sand, the same uneven ground that once trapped ships' anchors for good. Depth stays shallow throughout, somewhere between 12 and 20 metres depending on which part of the reef you follow, so there's no deep-stop planning to worry about. Divers move between the rock formations and through the holes and arches, working the cracks and crevices where the small life concentrates. Common octopus and conger eel are the two names that come up most; moray eel, cuttlefish and scorpionfish show up too, alongside smaller crabs and nudibranchs tucked into the same holes.
Ancoras' pull is a piece of history divers can see for themselves: the reef's holes still hold what ships left behind here over three centuries, a concrete, checkable story with anchors visible in the rock (the full account is below). That sets Ancoras apart from the Algarve's headline wrecks further along this coast: sunken vessels with a name and a date, where this reef holds scattered hardware from repeated losses spread over centuries. The site also needs no advanced certification and no long boat run: it sits inside the same cluster of Lagos dives used for beginner and try-dive trips, near the limestone arches and sea caves of Ponta da Piedade, the headland above it and Lagos's own signature landmark out of the water.
The reef's holes are the reason for its name. Ships anchoring off Ponta da Piedade across the 17th, 18th and 19th centuries would sometimes lose their anchors for good, the metal wedged permanently into gaps in the rock; divers exploring those same holes today are looking at the leftovers of that slow, cumulative loss. No specific ship or dateable incident survives in the telling: what's visible in the rock built up gradually, ship by ship, across three centuries.
Ancoras is boat-only, departing Marina de Lagos; no shore-entry option is documented. Pack a 7mm wetsuit with hood, gloves and boots whatever the season; this coast never warms enough to skip any of it. Visibility on an average day sits toward the lower end of the Algarve's typical range, and a clear 20-metre day counts as a bonus, not the norm. Current strength isn't documented for this specific reef, so ask the boat crew about it instead of assuming. Marine-protected status for this stretch is unresolved, and no permit or fee applies. A torch isn't documented as required here specifically, but several neighbouring Lagos reefs recommend one for their rock holes and passages; given Ancoras' own holes and arches, carrying one is a sensible, low-cost precaution.
What makes this dive site stand out.
Ships losing anchors off Ponta da Piedade left them trapped for three centuries
Holes and small arches make the terrain more varied than a flat reef
Sources put the deepest point anywhere from 17 to 20 metres
Minimum certification is Open Water, no deep or specialty requirement
37.0787°N, 8.6662°W
The Algarve's clearer, milder months area-wide; August is repeatedly flagged as the weakest for clarity
No source suggests AOW, deep or specialty training for this site; Open Water covers the depth most sources report, 17 m, but the wider quoted range reaching 20 m sits past the standard Open Water limit and would call for more training if it holds
PADI names Open Water Diver as the useful course for this site, and the reef's structure of holes and small passages keeps the technical demand modest at the depths reported here; current strength isn't documented specifically for this site, so check that day's conditions with the boat crew before assuming calm water
Book a guided dive at this site.

German-owned SSI/PADI dive centre at Luz Bay Club, Praia da Luz near Lagos, running shore and boat dives across the western Algarve since 1996.

SSI Instructor Training Center at Marina de Lagos, running daily boat trips from 8 to 35 m across Ponta da Piedade and the Ocean Revival wrecks.

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There's no single number, only two overlapping readings: 17 metres shows up most often, and one wider community source spreads the range out to 12-20 metres. Read together, they describe an uneven reef with no flat floor, not two separate site conditions. Which figure applies on any given dive comes down to where the boat anchors that day, so it's worth asking before you commit to a plan around the deeper end.
Open Water Diver is the course most commonly named as useful for this site, and no operator or authority suggests Advanced, deep or specialty training is needed. That covers the depth most sources report here, 17 metres; the wider quoted range reaching 20 metres sits past the standard Open Water limit, so plan to the shallower figure and check with your operator before the deeper one.
Neither status is settled. No official source places Ancoras inside a marine protected area, but none rules it out either for this stretch of coast; treat it as unresolved. No specific permit or diver fee applies. Portugal's national diving law (Lei n.º 24/2013) still governs recreational diving generally, licensing schools and instructors through IPDJ.
Most likely not. One catalogue entry alone describes 'artifacts of the Roman era' here, standing apart from two other write-ups, an operator's own account and a separate catalogue, which describe the anchors instead as belonging to ships from the 17th to 19th centuries.
There's no shore-entry option documented for Ancoras; every source describes access strictly by boat, leaving from Marina de Lagos. Local Lagos dive centres include the reef on their regular boat programs.
Common octopus and conger eel turn up regularly, tucked into the same rock holes that once trapped ships' anchors. Moray eel, cuttlefish and scorpionfish are also reported, along with smaller life like crabs and nudibranchs in the cracks.
It's a reasonable idea, though not something documented specifically for this site. Several neighbouring reefs in the same Lagos cluster recommend a torch for exploring their rock holes and passages; Ancoras' own description doesn't repeat that advice, but given its similar holes and small arches, a torch is worth packing along.
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