We run the small speedboat into the Algar de Benagil every summer day, and “can I swim in?” is the question we field most often — usually from a couple who saw the photo six months ago and built half a trip around it. The honest answer changed in September 2023, and that’s what trips most first-time visitors up. The full picture lives in our complete Benagil Cave Tour guide; this piece is the deep answer to the question that has shifted most.

The Short Answer

No — since September 2023 you cannot swim into the Algar de Benagil from a boat tour, and unsupervised swimming from Benagil village beach into the cave was restricted at the same time. You can still enter the cave on a small boat, a kayak, a stand-up paddleboard, or a licensed guided swim tour from the beach.

The rule was issued by the Capitania do Porto de Portimão — the port captain’s office, the local maritime regulator — and covers both the swim-from-a-boat scenario and the unsupervised swim-from-the-beach “free hack” older guide blogs still recommend. The cave itself is open. The rest of this piece walks through what changed, what’s still allowed, and how the rule is enforced.

What Changed in September 2023

In September 2023 the Capitania do Porto de Portimão issued an edital — a maritime regulation — that ended unrestricted swimming into the Algar de Benagil. The change followed a rising count of incidents involving swimmers, kayakers, and paddleboarders in and around the cave, and was framed as a measure to reduce drowning risk and protect the cave floor.

The rule came in under the authority of the Capitania (which sits inside the Polícia Marítima structure). It restricts swimming into the cave from any boat and ends unsupervised swim-ins from Benagil village beach. Further refinements went to public consultation in May 2024 — the English-language coverage in the official navigation rules on Sul Informação is the cleanest source. The rationale was twofold: rising incidents, plus ecological damage to the cave floor.

Can You Swim From the Beach?

No — unsupervised swimming from Benagil village beach into the cave is restricted under the same 2023 rules. The beach itself remains a public Algarve beach, open to swimmers like any other. What changed is the swim-in path: you can no longer set off from the sand and follow the coast east to the cave on your own.

This is the distinction most travel blogs still get wrong. Posts written before 2023 frame the beach swim as the “free hack” — walk down on a calm morning, swim 200 metres along the cliff, you’re inside. The one exception is the operator-led guided swim tour from the beach, run by a small number of licensed operators under a guide-to-swimmer ratio set in the regulation — the only legal way to swim into the cave today.

What Is Still Allowed in 2026

Plenty. The cave is open — what’s restricted is swimming into it from the open sea. You can still enter by speedboat, mid-sized motor yacht, kayak, SUP, or licensed guided swim tour.

  • Small motor boats and speedboats — slips through the ~2.5m arch, holds inside five to ten minutes, backs out.
  • Mid-sized motor yachts — the Cranchi 38ft clears the arch and enters the cave. A tall-mast sail yacht does not: the mast doesn’t clear, so it anchors outside and you see the skylight from the water.
  • Kayaks and SUPs — launch from Benagil beach with a guide. Under the 2023 rules, rentals along the Lagoa stretch (Vale Centeanes, Carvalho, Barranquinho, Albandeira, Barranco) require one guide kayak per five rented craft.
  • Licensed guided swim tours from the beach — the only legal way to swim into the cave today.
  • The clifftop viewpoint — a short walk above the cave from Benagil village; you look down through the skylight rather than seeing the inside.

For the port-by-port breakdown, see our piece on how to get to the cave.

How the Rule Is Enforced

The Polícia Marítima patrols the cave entrance and the wider Lagoa coast under the authority of the Capitania do Porto de Portimão. The enforcement risk lands on operators, not passengers: a captain who lets guests swim in faces fines and risks the licence the boat depends on. Passengers won’t be arrested — but the boat won’t take you in.

We won’t take swimmers in, and no licensed operator will. The fines and licence loss land on us, not the guest, and no captain is rolling that dice for one trip. An independent swimmer from the beach faces less personal consequence, but the Polícia Marítima patrols this stretch in summer and the situation gets ugly fast if there’s an incident. The Atlantic swell and the cave’s currents are unforgiving — the rule exists because people were getting hurt, and the enforcement is a backstop.

The honest closest alternative is taking a small boat in. A speedboat clears the arch, slips inside, and the skipper holds position for five to ten minutes while you take photos with the skylight overhead. It isn’t the same as swimming through — it’s the lawful 2026 version of it.

You stay on board the whole time; the cave visit itself is short; the half-day around it (Marinha’s arches, Carvalho’s yellow cliffs, a swim stop in a quiet bay) is what fills the rest. A few legal options exist — speedboats, the Cranchi 38ft as a private charter, kayaks and SUPs — and the simplest is the speedboat. Our Benagil speedboat tour leaves from Porto Comercial de Portimão (signposted Ac. Porto Comercial de Portimão) and runs as a small-group half-day of about 1.5 to 2 hours.

Why the Rule Is the Right Call

The rule exists because people were getting hurt. The cave’s interior has surge, the Atlantic swell stacks the entrance, and an unguided swim from the beach is a 200-metre crossing past boat traffic in water that hides its currents. Most days the cave is calm and the photo is easy; one day a year it isn’t, and that’s the day people get into trouble. The 2023 restriction shifted the risk from the swimmer to the operator.

For the full picture on visiting in 2026 — which port, when, which boat — our full Benagil Cave Tour guide is the next read. Questions about access on a specific date? Message us — we run these tours and will tell you straight what’s possible.