The Kawah Ijen volcano in East Java, Indonesia, is home to the Blue Fire Crater, a destination famous for its luminous blue lava flows.
But that’s not lava. It’s flame. The phenomenon is caused by molten sulfur and flaming sulfuric gases, which are released by fumaroles near the base of the volcano’s crater. Photographer Reuben Wu recently made the almost three-hour trek—that’s two hours up the volcano rim, and another 45 minutes down to the bank—in order to snap the faux lava flows in the dark of night.
via Mental Floss
Image: Reuben Wu
