The Algar de Benagil needs no introduction by now: a vaulted sea cave beside Benagil beach whose collapsed dome opens a round skylight to the sky, sun pouring onto a private beach of golden sand inside — the single most famous natural image of the Algarve.
Fame brought rules. Since 2023–24, swimming to the cave is banned (fines up to €2,500) and entry is restricted to licensed operators: small tour boats pass through the arches, and guided kayak or SUP groups may enter — capped numbers, around eight minutes inside, no landing on the cave's beach. Tours leave from Benagil beach itself and from the marinas at Portimão, Carvoeiro and Armação; morning sea is calmest and the skylight's light beam peaks around midday.
From land, the Seven Hanging Valleys path crosses directly over the dome — peer down the skylight before or after seeing it from the water.
Highlights
- Collapsed-dome skylight over a hidden beach
- Entry only by licensed boat, kayak or SUP tours
- Swimming banned since 2023–24 (fines to €2,500)
- About 8 minutes inside; no landing on the sand
- The trail above crosses the skylight itself
History & context
Carved by the sea along a fault in the Miocene limestone, the algar's dome collapsed into its famous oculus; a fishermen's secret until the 2010s, social media made it world-famous and the 2023–24 captaincy rules now protect it from its own success.
🗓️ Best time to visit
Morning tours for calm sea; around midday for the skylight beam; book a day or more ahead in summer.
⏱️ Duration
1–2 hours including the tour
♿ Accessibility
By water only; tours board from the beach or nearby marinas.
Frequently asked questions
Can I swim into the cave?
No — swimming to the cave is banned, with fines up to €2,500. Entry is only with licensed boat, kayak or SUP tours.
Can you land on the beach inside?
No — landing inside is prohibited; kayak and SUP groups float through with a time limit of around eight minutes.
When is the light best?
Late morning to early afternoon, when the sun drops through the skylight; mornings give the calmest sea for entries.