Joses, my hiking guide on the edge of the Marum crater on the top of Mt. Marum. There was enough of the irritating volcanic gas in the air to warrant using the gas masks we brought along.
Mt. Marum has a pool of molten lava down in it's crater floor, 600 meters behind and below where Joses was standing in this photo. We could hear it bubbling and churning through the fog, but the pea-soup thick fog and clouds weren't in the mood to allow us a glimpse this day.
Location: Ambrym island, Vanuatu
Lens used: 17-55mm f2.8 IS