At nearly 3 kilometres in length, with 800 meters of navigable waterway, the San José underground river is not only the longest in Europe open to boat tours, but also one of the most visually stunning cave systems on the continent. Flowing through limestone formations, the river has carved out surreal galleries, tunnels, and chambers, many adorned with delicate stalactites and stalagmites.
The river’s exact source and outlet remains unknown. Explorers have mapped a considerable stretch, and continue to discover more of its tunnels, and cave systems.
The guided boat ride lasts around 40 minutes and offers a serene glide through turquoise waters beneath low-hanging cave ceilings. Visitors are seated in small boats (usually holding around 10 people). As you drift through narrow corridors and vast open spaces like Lake Diana and the Blue Lake, you’ll witness underwater reflections, optical illusions, and breathtaking mineral formations.
One of the most thrilling stops is the Sala de los Murciélagos (Bat Chamber), where hundreds of bats once dwelled, and the Catedral chamber, where the Medusa stalactite impressively mimics the shape of the mythical sea creature.
Photography is limited inside the caves for safety reasons, especially during the boat ride. Some areas allow restricted filming, but due to low ceilings and the need to duck frequently, visitors are advised to focus on the experience rather than capturing it. Cameras mounted to the body may be used in some cases.
Are the San José Caves family-friendly?
The caves are suitable for most age groups, as the boats are relatively easy to board and disembark without assistance. The temperature inside remains a steady 20°C, making it comfortable year-round. While not fully wheelchair accessible, much of the site is designed to accommodate visitors with limited mobility.
Are there alternative activities in the area?
For the more adventurous, kayaking tours are available under supervision. Visitors can even swim in designated sections wearing wetsuits. In recent years, the caves have also hosted live concerts, and with the incredible acoustics it is a truly one-of-a-kind experience.
There are also some picturesque walks in the surrounding area.
Tickets, Parking & Tips
Tickets should be booked in advance via the official Cuevas de Sant Josep website due to high demand, especially in summer.
https://www.covesdesantjosep.es/
Standard adult tickets are around €10–€15.
A small museum, café, and gift shop are located near the entrance.
Comfortable footwear and light jackets are recommended.
Few experiences in Europe compare to gliding silently through this underground river while surrounded by ancient geological formations shaped over thousands of years.
If you’re looking for one of the most unique things to do in the Valencian Community, this underground adventure should be at the top of your list.
