Coves Sant Josep
A river of
feelings adventure fun

Discover the longest navigable underground river in Europe

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Les Coves de Sant Josep

A unique natural environment

The cavity is visited on a quiet boat trip, accompanied by a Guide-Barquero, sailing the underground river, more than three kilometers long explored at the moment, traveling 800 meters by boat (blue zone) and 255 by foot (brown zone ). There are more than two kilometers, at least, inaccessible to visitors at the moment (red zone and beyond).

The visit lasts approximately 40 minutes, with a constant temperature of 20º throughout the year.

Navigable section
Dry gallery
Speleotourism zone

A river of sensations

Located on the Costa de Azahar, in the heart of the Mediterranean and at the gateway to the Sierra de Espadán Natural Park, Les Coves de La Vall d’Uixó is the longest navigable underground river in Europe, where the visitor You will find the nature and the sensations of peace and harmony that only Earth knows how to give us.

Una aventura dentro del corazón de la Tierra

Un espacio natural único

Un viaje que hará que el visitante descubra nuevas sensaciones


The Subterranean River of the Grottoes of San Jose (in Valencian, Les Coves of Sant Josep), located in a natural place, is a natural cave located in the municipality of Vall de Uxó (Castellón) Spain.

The cavity represents an active upwelling developed in limestone during the Middle Triassic period, but despite the multiple visits of speleologists, the origin of the river or the end of the cave is not yet known. The temperature is maintained constant at 20 ºC inside the cave throughout the year, and with its current 2,750 meters, represents the largest cavity of the province of Castellón and the 2nd of the Valencian Community. It is the longest navigable underground river in Europe.

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