The Jameos del Agua are underground cavities that are in the municipality of Haria in the north of the island of Lanzarote in the Canary Islands. These formations are the result of the eruptive activity of the volcano Corona that took place there between 3000 to 5000 years ago. There is a tunnel between the volcanic cone and the ocean over 6 kilometers long, with two major tourist centers. Tourists can visit the Cave of Los Verdes, through an underground tour of more than a kilometer. You can get to Jameos del Agua through a site designed by César Manrique. You should start your tour by a winding staircase that leads you to Jameo Chico, then you will find the Jameo Grande; an underground salt lake and crystal water where sunlight penetrates through a hole in the cave roof. There is a bridge across the lakeand you could see the small blind crabs that live there and out you will find a succession of volcanic stone terraces that culminate with a pool surrounded by palm trees. There is also a concert hall with 600 seats.
You should allow one hour for the visit. There is a restaurant and a cafeteria. If you like the pictures and light effects, do not miss the opportunity to visit the place at different times. For a great view, go to the terraces. If you are interested in volcanology, there is a scientific center for the study called The House of Volcanoes, you will find several rooms that address different aspects.
If you visit the place between July and September, if you do not want to find a lot of people, do it 1 or 2 hours before closing.