Home World The incredible 2,700m long underground river that you can even kayak down

The incredible 2,700m long underground river that you can even kayak down


In the heart of Spain’s Castellón province, the ancient cave system known as the Cave of San José in Vall de Uxó is home to an extraordinary 2,700-metre-long underground river, the longest in Spain and possibly in Europe.

This hidden gem, within the Sierra del Espadán Natural Park, offers an unforgettable journey through time and nature, where travellers can experience a unique adventure: kayaking down this incredible underground waterway.

Formed over 250 million years ago, the Cave of San José has a rich history, with evidence of human habitation dating back to the Palaeolithic era. It has served as a refuge for Iberians and Romans, as well as a sacred place imbued with countless legends.

Visitors to the cave can choose from a variety of experiences, from guided boat tours through 800 meters of the underground river to adventurous kayaking trips that explore more remote sections of the cave.

The latter is an exclusive experience, allowing participants to navigate through sections that are off-limits to traditional tours, offering a more intimate and exhilarating exploration of this natural wonder.

The kayaking adventure begins once the general public visits have concluded in the evening. Donning wetsuits and helmets, adventurers walk a hundred meters into the river to reach the jetty, where they board single or double kayaks for a 45-minute journey through the underground river.

The route winds through large rooms and narrow channels, illuminated by ethereal limestone formations and reflecting pools of blue and white water.

Along the way, kayakers can explore key points of interest, such as the “Boca de Forn,” the “Cascada de la Flor,” the “Galería de los Sifones,” and the grand vaulted room known as the “Catedral,” with its impressive stalactites and intricate rock formations.

In some spots, the river reaches depths of more than ten meters, while in others, travellers can leave their kayaks and take a refreshing swim in the crystal-clear waters.

The experience is enchanting, with the underground grotto whispering stories and secrets as you navigate its depths. The only sounds are the gentle splash of paddles, the beating of hearts, and the murmur of the flowing river. It’s a journey that evokes a sense of harmony, peace, and wonder, where the timeless beauty of nature reigns supreme.

For those seeking a truly unique and unforgettable adventure, the Cave of San José in Vall de Uxó offers a captivating experience unlike any other.

Alongside the kayaking, visitors can explore the area’s other attractions, including the “Water Way” aqueducts, the neoclassical church of Santo Angel Custodio, and the Iberian archaeological site with its ancient engravings.

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