Lava Tube Tours in Reunion Island: 3 tours of Piton de la Fournaise's tunnels, 2026 prices

This is the most-reviewed lava tunnel tour you can book by the seat in Reunion Island, with 482 verified Viator reviews averaging 5 out of 5. It lasts about 3 hours and starts from the 2001 lava flow car park on the RN2 between Sainte-Rose and Saint-Philippe (one of the island's most striking roads for volcanic scenery).

It starts with a 15-minute walk over the ropy (pahoehoe) lava of the 2004 flow to the tunnel entrance. Once kitted out (helmet, head torch, gloves, knee pads), you move in single file through the network of tunnels that formed when the surface lava cooled while molten lava kept flowing underneath. The guides explain how they formed and point out the lava stalactites, stalagmites and layers of successive flows.

What makes the 2004 flow's tunnels different from others open to visitors (the 1998 flow, the Lichens tunnel at Pas de Bellecombe, etc.): they're recent and therefore well preserved, fairly easy to reach from the east coast, and have passages several hundred metres long with 2-4 metre ceilings, so you can walk upright most of the way. It's the most instructive way to understand how a lava tunnel works.

Viator price €70 per person. Suitable for children aged 7-8 and over who aren't afraid of the dark and can keep up with the group for 3 hours. You'll need closed shoes (no flip-flops: trainers at least, but walking boots are better for the rocky walk in), a light warm layer (it's only 18-20°C underground, even in the hot season) and long trousers to wear under the knee pads.

This tour is sold through Manawa and run by Réunion mer et montagne, one of the island's longest-established volcanic caving operators. An average of 5 out of 5 from 413 verified reviews, 96.4% of them rating it "Excellent", makes it the platform's top-rated lava tunnel tour by number of reviews.

The trip lasts exactly 3 hours, including the walk in, inside the tunnels of the 2004 flow. The meeting point is the 2001 lava flow car park on the RN2 between Sainte-Rose and Saint-Philippe. All the gear is provided (helmet, head torch, gloves and knee pads), and you can only enter the underground network with a qualified volcanic caving guide.

How it differs from the €70 Viator tour: it's €15 cheaper and the operator is named (Réunion mer et montagne), whereas Viator acts as a middleman and may assign different local operators without you having a say. All the reviews on the Manawa listing are about the same operator, so they give you a more reliable idea of what to expect.

Manawa price €55 per person for 3 hours. Flexible cancellation with a weather guarantee (free rebooking or a refund if the trip is called off because of the weather). Minimum age 7. A good fit for families with children aged 7-8 and over who aren't afraid of the dark, and for travellers who prefer a named operator to a generic marketplace.

This is the longer, more immersive Viator lava tunnel tour: 4 hours on site (versus 3 hours for the short tour), exploring several sections of the 2004 flow's network. It averages 5 out of 5 from 336 verified reviews, and is even €5 cheaper than the short tour despite the extra hour and fuller route.

The extra time lets you go further into the network (some sections involve short crawls or clambering over secondary lava flows), linger at the most striking formations and learn more about volcanic geology along the way. The pace is more relaxed than on the short tour, which covers the essentials but doesn't explore as far.

Who it's for: volcano enthusiasts, photographers who want time to set up several shots, and groups of friends who want the lava tunnel to be a highlight of the trip rather than a quick outing. Suitable for the same people as the short tour (from age 7-8, reasonably fit), but you'll need more stamina for 4 hours underground.

Viator price €65 per person. Same as the short tour for gear (helmet, head torch, gloves and knee pads provided) and clothing (closed shoes, a light warm layer, long trousers). Cancellation under Viator's terms, shown on the listing when you book.