Visiting a lava tube in Réunion
Dive into the heart of the Piton de la Fournaise through underground galleries carved by lava. A one-of-a-kind adventure, easy to add to your van road trip.
Réunion is famous for its still-active volcano, the Piton de la Fournaise. But beyond the crater and the surface lava flows, the island hides a real underground treasure: its lava tubes. These natural galleries, formed by the flow of molten lava, offer a dive into the belly of the volcano that’s open to everyone, from age 6.
In a camper van, you can easily combine a night’s bivouac near the volcano with a day of underground exploration. This guide explains how it works, where to go, which route to choose for your profile, and where to sleep before or after the adventure.
What is a lava tube?
Lava tubes are natural galleries formed during eruptions of the Piton de la Fournaise. When molten lava flows, its surface solidifies on contact with the air and forms an insulating crust. Inside, the lava keeps flowing. Once the eruption is over, the tube empties and remains — frozen for decades, sometimes millennia.
In Réunion, there are recent tubes (2004 flow, 2007 flow) and others much older, such as the Bassin Bleu tube in Saint-Gilles, around 350,000 years old. Each gallery tells a different geological story: lava stalactites, light shafts, sparkling crystals, vitrified ceilings…
The 2004 and 2007 flow tubes are currently closed due to ongoing eruptive activity. The other tubes (notably the Bassin Bleu) remain open all year round.
Where to visit a tube in Réunion?
There are several exploration sites on the island, each with its own features:
Bassin Bleu tube — in Saint-Gilles, on the west coast. It’s the oldest and most spectacular tube: very large chambers, walls adorned with white crystals, natural light shafts. Ideal for families thanks to its easy access and comfortable dimensions. Open from age 6.
2004 Flow tube — in Sainte-Rose, in the south-east. A recent tube, raw frozen-lava landscape, a horizontal route ideal for discovering the activity (temporarily closed because of the eruption).
Citron Galet tube — in Saint-Philippe. Open as a replacement when the 2004 Flow is closed. A raw, mineral atmosphere.
The Bassin Bleu is 15 minutes by van from Saint-Gilles-les-Bains. It’s the most convenient option if you’re already on the west coast. For the south-east tubes (Sainte-Rose, Saint-Philippe), plan to sleep the night before in the Wild South.
Which route to choose?
Specialist guides offer three main categories of outing:
Discovery route (from age 6) — About 2h, open to everyone. Walking through the tube, observing the geological formations, stories about volcanology. The ideal format for families or a first visit. Price: €50 adult, €40 child.
Sporty route (from age 10) — About 2h30. Crawling sections, small climbs, narrow passages and abseiling for the most committed. You need to be in good physical shape. Price: €70 adult, €50 child.
Unusual routes — The original experiences at the Bassin Bleu: blind wine or beer tasting underground, guided meditation in absolute silence, or even an underground bivouac for a unique night. From €70.
Walking through a lava tube is stepping into the belly of a sleeping volcano. No more noise, no more signal, just the stone and the beam of your lamp. A timeless experience you won’t forget.
Equipment and preparation
The good news: all the technical equipment is provided by the guides. Helmet with headlamp, harness, gloves, knee pads, descender for the sporty routes — you don’t need to bring any gear.
On your side, just bring:
• Closed shoes such as trainers or hiking shoes (no flip-flops or sandals)
• Long trousers required (knees and shins protected)
• At least 50 cl of water per person
• A small backpack for two
• A change of clothes to leave in the van (you may come out dirty or damp)
The underground environment requires good mobility. The activity is not advised for pregnant women, people with heart conditions or asthma. If you’re claustrophobic, opt for the Bassin Bleu (large open chambers) rather than the sporty routes.
Where to sleep in your van before the visit
If you visit the Bassin Bleu in Saint-Gilles, you’re ideally placed on the west coast: spend the night at Boucan Canot, l’Hermitage-les-Bains or in the heights of Saint-Paul. Several areas allow overnight van parking.
For the south-east tubes (Sainte-Rose, Saint-Philippe), sleeping the night before in the Wild South is the best option: Manapany, Le Baril or the Tremblet area offer peaceful spots close to the starting point.
The van advantage: over 2 or 3 days you can combine lava tube + ocean-front bivouac + sunrise at the volcano + Plaine des Sables, with no accommodation to book.
For the west coast before the Bassin Bleu: the Colimaçons area (Saint-Leu) offers quiet high-altitude spots with sea views. For the Wild South: the Manapany-les-Bains area, 30 min from the Saint-Philippe tubes.
Everything you need to know before you go
A few practical tips to plan your lava tube outing by van:
When to visit
All year round. The tube stays at a constant 18–20°C, whatever the weather outside.
Departure times
Two slots: 8 am or 12 pm. Booking required, especially in high season.
Minimum age
6 for discovery routes, 10 for sporty ones, 18 for the underground tastings.
Photos
Allowed and even encouraged. Remember to protect your camera (damp, knocks).
Mobile signal
No signal underground. Let your loved ones know and download your maps offline.
Weather
In heavy rain, some outings may be postponed for safety reasons.
Bazaltik Réunion
Our go-to partner for lava tubes. State-certified guides, full equipment provided, routes for all levels. Over 10 years of experience and 4.9/5 on customer reviews.
Ready to live this adventure?
Book your camper van and combine lava tube, volcano bivouac and recent lava flows for a total volcanic immersion in Réunion.
Book my van →
