The experience of visiting one of the world’s biggest lava tubes. Cueva del Viento-Sobrado is in the town of Icod de los Vinos, in the north-east of Tenerife. It is the largest lava tube in Europe, and thought to be the fifth largest in the world after four in Hawaii. Its many underground passages span more than 17 kilometres. Cueva del Viento was shaped by lava flows from Pico Viejo, a volcanic cone alongside Mount Teide. A lava tube is a cavity that forms inside lava flows. As the lava flows and comes into contact with air, the surface of the flow cools and creates a layer of insulation, while the lava continues to flow inside until the flow stops and a volcanic tube is left. The tour starts at the visitor centre, where a vehicle picks up the group and drops them off close to the entrance. The visit continues on foot through medium-altitude farmland, pine forests and an old royal road. The visitor centre and the inside of the tunnel have bilingual panels which, along with your expert guide’s explanations, provide detailed information about the cave, the lava formations and the wildlife that lives inside. This visit is of intermediate difficulty and takes two hours to complete from the starting point. Visitors are inside the cave for around 45 minutes, exploring some 250 metres of the tubes. If you would like to visit Cueva del Viento, you should remember that: The Visitor Centre is open to the public from 9 am to 4:30 pm. Tours are available in English, German, French and Spanish every day at different times. Groups are limited to 15 people, so visitors should book ahead by visiting www.cuevadelviento.net and writing an email to email@example.com. For groups of more than 20 people we do not accept telephone bookings. If you have any questions, please send us an email or call us at 922 815 339 during opening hours. Please be at the Visitor Centre at least 30 minutes in advance. Visiting instructions Visitors must wear long trousers and hiking boots or trainers. Always follow the guide’s instructions. Do not stray from the signposted route or from the group. Do not jump inside the cave. The floor is uneven and you might injure yourself. Do not remove your helmet under any circumstances. If you are tired, please notify the guide immediately. Do not litter and leave the cave as you found it. Remember that this is an extremely valuable protected ecosystem. Keep the noise level down so as not to disturb the local wildlife and other visitors. Pets are not allowed. Do not take anything from the surroundings. Each guided tour group will comprise 15 visitors. If you are late, you may miss your chance to take part. Remember that access to the volcanic tube is limited to protect the ecosystem. The trip is not suitable for children under the age of five, people who have claustrophobia or people with reduced mobility in bones, knees and ankles. Getting here by car: Take the TF-5 northern motorway towards Icod de Los Vinos. When you arrive in the town, take the TF-366 road to El Amparo and follow the signs to the Visitors Centre - Cueva del Viento. When you get to the El Refugio restaurant, turn left and continue for one kilometre to the Visitors Centre.