The roof opening, or 'eye,' was created by the natural collapse of the limestone ceiling due to wave erosion at the base.
The cave is only accessible at low to mid-tide, as high tide can cover the internal beach entirely.
The name 'Algar' refers to a specific type of geological sinkhole found in limestone terrain.
The cave is located roughly 150 meters from the coast of Benagil Beach.
The interior beach is composed of fine, golden-hued sand deposited by tidal action.
The Benagil Cave, or Algar de Benagil, is a natural sea cave located on the Algarve coast of Portugal, distinguished by a large, circular hole in its ceiling known as an 'algar' that allows sunlight to illuminate the sandy interior. Formed over millions of years by the erosion of limestone cliffs by the Atlantic Ocean, the cave is only accessible via water. The interior features a secluded beach that remains largely shaded, except when the sun is directly overhead. It is a protected geological feature and swimming inside the cave is subject to strict local safety regulations. The cave is part of a series of coastal rock formations accessible from the nearby village of Benagil.
From inside the cave looking directly up at the skylight opening.
Book a guided boat tour from nearby harbors, as unauthorized swimming or unguided kayak access is often restricted for safety.
Bring a waterproof camera or dry bag to protect electronics from salt spray and potential splashes.
Check tide tables before planning any visit, as the cave beach is inaccessible at high tide.
Attempting to swim from the shore to the cave, as the currents near the cliffs are unpredictable and dangerous.
Boat tours may be suspended during periods of rough sea conditions or high wind, regardless of the season.
Wear water-appropriate footwear and life vests if provided by operators; swimming and landing on the beach is strictly regulated and sometimes prohibited for safety.
