The cave system contains the largest underground river in Europe that is currently navigable.
Archaeologists have discovered cave paintings and engravings dating back at least 15,000 years near the entrance.
Despite extensive exploration, the exact source of the underground river remains unknown.
The cavern's microclimate keeps the water and air temperature consistent year-round, regardless of external weather conditions.
The cave was utilized for human habitation during the Solutrean and Magdalenian periods of the Stone Age.
Coves de Sant Josep features the longest navigable underground river in Europe, located within the Sierra de Espadán Natural Park. The cave system consists of a 2,750-meter-long river that remains largely unexplored beyond the designated tourist circuit. Visitors traverse approximately 800 meters of the river by boat, followed by a short 250-meter walking section. The cavern maintains a constant internal temperature of 20°C throughout the year. The limestone galleries exhibit significant geological formations, including stalactites and stalagmites shaped by subterranean water erosion. Archaeological evidence confirms the caves were inhabited as early as the Upper Paleolithic period, with cave paintings discovered near the entrance. The site is a protected cultural asset and part of the UNESCO World Heritage list under the Rock Art of the Mediterranean Basin on the Iberian Peninsula.
The 'Hall of Bats' (Sala de los Murciélagos) offers the most expansive view of the illuminated rock formations.
Book your time slot well in advance online, as tickets often sell out days ahead during peak season.
Bring a light sweater or jacket, as the constant 20°C temperature can feel chilly compared to the hot Spanish summer.
Arrive at least 30 minutes before your scheduled departure to ensure smooth check-in.
Attempting to visit without a pre-booked reservation, as walk-in availability is extremely rare.
Closed on specific dates during the winter months, typically January and occasionally for maintenance in early December.
No flash photography is allowed inside the cave to protect the rock formations and cave art; remain seated in the boat at all times.
