Túnel de la Atlántida () is the world's longest known volcanic submarine

lava tube A lava tube, more rarely called a pyroduct, is a 'roofed conduit through which molten lava travels away from its vent'. If lava in the tube drains out, it will leave an empty cave. Lava tubes are common in low-viscosity volcanic systems. La ...

. It is located in the

Canary Islands The Canary Islands (; ) or Canaries are an archipelago in the Atlantic Ocean and the southernmost Autonomous communities of Spain, Autonomous Community of Spain. They are located in the northwest of Africa, with the closest point to the cont ...

off the coast of North Africa. It is the underwater portion of the

Cueva de los Verdes Cueva de los Verdes ( Spanish for "Verdes' cave", from the "Verdes" family) is a lava tube and tourist attraction of the Haria municipality on the island of Lanzarote in the Canary Islands (Spain). The cave lies within the Monumento Natural del ...

lava tube at Haría, Las Palmas. The 1.5 km long tube formed some 20,000 years ago when the

Monte Corona Volcán de La Corona is a high extinct volcano on the Canary Islands, Canary Island of Lanzarote (Spain), near the village of Ye, Lanzarote, Yé in the municipality of Haría, Las Palmas, Haría. Its eruption, around 21,000 years ago, covered ...

volcano erupted on the island of

Lanzarote Lanzarote (, , ) is a Spanish island, the easternmost of the Canary Islands, off the north coast of Africa and from the Iberian Peninsula. Covering , Lanzarote is the fourth-largest of the islands in the archipelago. With 163,230 inhabi ...

. The erupted molten rock flowed across the land and into the ocean.

References

Lava tubes Lanzarote Volcanism of the Canary Islands Caves of the Canary Islands {{volcanology-stub