The Grotte de la Verna, located in the Pierre Saint-Martin cave system in the French Basque Country, is one of the largest underground chambers open to the public in the world. Situated in the Pyrénées-Atlantiques region, near the border with Spain, this immense cavern is a geological and speleological marvel, drawing visitors for its vast dimensions and unique subterranean landscape.

Discovered in 1953 by French speleologists, the chamber was originally accessed through complex cave networks before being made more accessible via an artificial tunnel. Today, visitors can explore the site through guided tours that highlight its geological formation, history, and scientific significance. The chamber itself is 250 meters long, 180 meters wide, and 194 meters high, making it one of the most impressive natural underground spaces in Europe.

The grotto is part of an extensive karst system formed by the erosion of limestone over millions of years. The Pierre Saint-Martin system, where the Grotte de la Verna is located, extends for more than 80 kilometers, ranking among the deepest cave networks in the world. The underground river that shaped the cave continues to flow, adding to the dynamic geological processes that make this site remarkable.

The visit to the Grotte de la Verna offers different levels of exploration, from introductory walks suitable for all visitors to more technical tours designed for those interested in speleology. Advanced lighting systems allow for a safe and immersive experience, showcasing the impressive scale and natural beauty of the cavern.

Accessible from Sainte-Engrâce, the grotto is a unique attraction in the Basque Country, offering an unforgettable experience in the heart of the Pyrenees.

More information: https://laverna.fr/