Valenciana, Comunidad·Spain
Photo: Simon Burchell · Wikimedia Commons (CC BY-SA 4.0)
The Coves de Sant Josep carry the longest underground river you can boat along in Europe, a guided glide by punt through galleries of the karst at La Vall d'Uixó. Beyond the show-cave section lies a wetter, harder world of sumps for equipped cavers.
In season: Year-round · Peak: Apr–Oct
An easy, family-friendly boat-and-walk trip through the lit river passage year-round; the Galería de los Sifones beyond needs a wetsuit, a guide and real caving. Cool inside whatever the season.
Beyond the tourist section, wetsuit and guide needed
Drive to La Vall d'Uixó and book the boat tour, busy in summer. For the wet through-section, arrange a specialist guided trip with equipment.
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