Descend into Ambrym's vast 12 km caldera to peer into Marum and Benbow — two of Earth's most active lava lakes. An expert volcanologist leads this raw, otherworldly trek that very few humans ever witness.
What to expect
The hike traverses dramatic ash plains dusted in grey pumice before the caldera rim reveals twin glowing craters below. At the edge of Marum, radiant heat rises and molten lava churns just metres beneath you — a sight that rewires your understanding of the planet. Benbow's deeper, narrower throat amplifies the roar and glow for an entirely different spectacle. The return hike at dusk, with the sky lit orange above the caldera, is utterly unforgettable.
Good to know
This is a 2-day, 1-night expedition requiring an overnight camp on the ash plains. Confirm your ship's overnight-stay policy if doing the full version; the day-hike to the caldera rim is achievable for fit passengers. Book directly via ambrym.com well in advance — slots are extremely limited. Sturdy hiking boots, headlamps, and dust masks essential. Factor at least 6–8 hours round-trip for the day version.
Sail there
Luxury cruises that call at Ambrym Island — book through us, the fare is identical and your concierge stays on your side.