Photo: Diego Delso, CC BY-SA 3.0
Coves de Sant Josep Day Trip from Valencia: Boating the Underground River at La Vall d'Uixo
Eight hundred metres of underground river in a punted boat, then two hundred and fifty on foot through a dry gallery. Tickets are timed and the daily quota is limited, so this is the one trip in the series you should book before you set off.
An underground river you cross by boat, an hour north of Valencia
The Coves de Sant Josep sit on the edge of La Vall d'Uixo, in Castellon province, where a river runs out of the rock after a course nobody has yet traced to its source. The visit is 1,050 metres long in total: 800 of them in a flat-bottomed boat punted by hand along the water, and 250 on foot through a dry gallery.
It takes about forty minutes and the cave holds a steady 20C whatever the weather is doing outside, which makes it one of the few trips here that works as well in August as in February. Over three kilometres of the system have now been explored by cave divers, and the operator calls it one of the longest navigable underground rivers in Europe.
Photo: Joanbanjo, CC BY-SA 4.0
What the visit to the Coves de Sant Josep involves
Book a timed slot before you travel
The operator sells dated, timed tickets online and states that daily tickets are limited and a visit cannot be guaranteed without one. Its own English wording is that it does not guarantee tickets will be available at the box office. A boat holds a maximum of fourteen people, and you are asked to arrive ten minutes before your slot; arriving late means losing the ticket, with no changes or refunds.
Rock art and an Iberian town at the cave mouth
The operator records human presence here from around 17,000 years ago, with Magdalenian paintings and rock engravings at the entrance, and a Bronze Age ceramic urn excavated near the embarkation point in 2020. On the hill directly above sits the Poblat de Sant Josep, an Iberian settlement with over forty metres of drystone wall still standing, which can also be seen from the mirador for nothing.
Make a half day of it in La Vall d'Uixo
The paraje around the cave has a picnic and barbecue area, a playground and cafes, and the Cami de l'Aigua water trail runs from there into the town centre. The Serra d'Espada natural park starts on the doorstep. The town has no paid street parking and no low-emission zone, which is a change from the city.
Photo: Simon Burchell, CC BY-SA 4.0
Booking, opening hours and getting to La Vall d'Uixo
Book online, and treat that as the default rather than a precaution. The operator's own page says plainly that daily tickets are limited and that it cannot guarantee a visit without an advance ticket, and that the box office sells only for the same day. At the time of writing the published prices are 18 euros for adults, 12 for children aged three to twelve, free under three, and 14 on the reduced rate for over-65s, students and visitors with a disability.
Opening hours are the one thing you cannot look up. The operator does not publish them at all and instead asks visitors to telephone for current times, so any timetable you find on a third-party site is worth nothing. The cave can also close at short notice when heavy rain raises the river, so check before you drive out. There is no station in La Vall d'Uixo and the nearest are eight kilometres away, which makes a car the practical option; parking at the cave is free, with a caravan area, and it is about a ten-minute walk from the car park to the entrance.
Official sources
- Coves de Sant Josep, the operator on the route, the 40-minute duration and limited daily tickets
- Coves de Sant Josep, published ticket prices and the note that opening hours are given by telephone only
- Coves de Sant Josep, frequently asked questions on booking, boat capacity and who should not visit
- Turisme La Vall d'Uixo, the municipal tourism office on the cave and how to reach the town
Coves de Sant Josep day trip FAQ
Do you need to book the Coves de Sant Josep in advance?
What are the opening hours of the Coves de Sant Josep?
Does the cave close in winter or for maintenance?
Is it the longest underground river in Europe?
Is the visit suitable for children or for wheelchair users?
How do you get to La Vall d'Uixo from Valencia?
Weighing up Valencia against the Castellon coast?
La Vall d'Uixo is seven kilometres from the sea and an hour from the city, which is the kind of trade-off worth thinking through before you sign a lease. A free consultation can help you compare.
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Resident in Valencia since 2016. Founder of BeTranslated. 25+ years in translation, interpretation and multilingual SEO.
Reviewed 14 September 2026 by Michael Bastin