National Geographic Travelのインスタグラム(natgeotravel) - 10月13日 09時05分

Photo by @andrea_frazzetta | Since 1968 the sulfur miners of Mount Ijen, Indonesia, have ventured into this unpredictable labyrinth of gas clouds and superheated fumaroles to extract “devil’s gold” and carry it back down the mountain. Ijen’s half-mile-wide turquoise crater lake takes on an eerie glow in the darkness. Deceptively beautiful, it has a pH lower than that of battery acid. The largest acid lake on Earth, it is caustic enough to dissolve metal.
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