About this place
Cueva de Don Justo is one of roughly 70 caves and volcanic galleries found on the island of El Hierro, located in the municipality of El Pinar de El Hierro, within the El Lajial lava field near the Faro de Orchilla lighthouse on the island's southern tip. It is the longest of the 28 known lava tubes on El Hierro, ranking as the third longest in the Canary Islands and the thirteenth longest in the world.
What kind of place is this?
The tunnel formed during a volcanic eruption, when the outer crust of a flowing lava stream cooled and hardened while molten rock kept moving underneath, eventually draining away and leaving a long, hollow passage behind. Inside, Cueva de Don Justo shelters a remarkable community of troglobitic species — animals fully adapted to permanent darkness — seven of which exist nowhere else on Earth. This rare biodiversity is the reason the cave holds scientific and conservation significance rather than being managed as a typical visitor attraction.
Can you actually go inside?
No. Cueva de Don Justo sits on private land and is not open to the public. It remains a wild, undeveloped cave with no lighting, walkways, or infrastructure of any kind. Access is restricted specifically to protect the endemic species living inside, which are threatened by tourism traffic, littering, vandalism, and invasive species such as cockroaches accidentally introduced by visitors. Anyone planning a trip to El Hierro should think of this site as a geological and ecological landmark to know about, not one to enter.
How do you reach the area?
The cave lies near La Restinga, El Hierro's southernmost village, known for its diving scene and relaxed fishing-village atmosphere. The surrounding El Lajial lava field and the Faro de Orchilla lighthouse — historically marked as the westernmost point of the Old World on the prime meridian used before Greenwich — are popular stops for hikers and drivers exploring the south of the island. The landscape here is raw and volcanic, covered in the sparse vegetation typical of El Hierro's dry southern coast.
What else is worth seeing nearby?
While the cave itself is off-limits, the surrounding region offers plenty above ground: the rugged black lava field, Atlantic Ocean views from Faro de Orchilla, and hiking trails winding through El Hierro's volcanic terrain. La Restinga makes a good base for exploring, particularly for its clear waters and diving spots inside the nearby Mar de Las Calmas marine reserve.
When is the best time to visit?
El Hierro enjoys mild weather year-round, but conditions for exploring the area and hiking are best from spring through early autumn, when temperatures are comfortable and daylight hours are longer. In summer, it's worth avoiding the midday heat, since the open lava terrain offers little natural shade.
Frequently asked questions
Can I enter Cueva de Don Justo? No. The cave is on private property and closed to visitors to protect the endemic troglobitic species living inside.
Why is the cave protected? It shelters seven animal species found nowhere else in the world, and tourism, littering, and invasive species pose a real threat to them.
How long is the tunnel? It's the longest known lava tube on El Hierro and the third longest in the Canary Islands.
What can I see nearby if the cave itself is closed? The El Lajial lava field, the Faro de Orchilla lighthouse, and the coastal village of La Restinga, a base for diving in the Mar de Las Calmas marine reserve.
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