A volcano in East Java that burns electric blue in the dark. Sulfurous gas comes out of the cracks at up to 600 degrees C and ignites, throwing flames five metres high, some of it condensing into liquid sulfur while still alight; it is the largest blue flame anywhere. In the crater sits the largest highly acidic lake in the world, measured below pH 0.3 and as low as 0.13 at its middle, which is battery acid. And men work in it: miners break loose sulfur and carry 75 to 90 kg baskets up 300 metres of 45 to 60 degree slope to the rim, then three kilometres down, for around thirteen dollars a day, mostly without masks. Roughly 14 tons a day comes out. Go at night with a guide and a proper respirator, and tip the miners.
Native sulfur
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Other places on the map within a couple of hours.
