Kawah Ijen Blue Fire Sulphur Flames — East Java Indonesia
Kawah Ijen's blue fire is one of the world's most extraordinary geological spectacles — burning sulphur gas escaping from vents in the crater walls combusts on contact with atmospheric oxygen, producing electric-blue flames reaching 5 metres in height that flow as liquid blue fire down the crater slope in the darkness before dawn. The blue colour produced by the combustion of sulphur dioxide is unique in the world as a sustained, visible natural flame phenomenon available for direct observation. The 2-kilometre trek to the crater rim in darkness and the descent into the crater deposits visitors on the world's most acid lake surface at sunrise: pH 0.5, turquoise from dissolved sulphuric acid, surrounded by yellow sulphur deposits and the blue-flaming vents above.
About this spectacle
In the hours before dawn, visitors descend into Kawah Ijen's volcanic crater to witness one of Earth's most surreal sights: sulphur gas venting from cracks in the crater walls ignites into vivid electric-blue flames that reach up to 5 metres high and run as glowing liquid fire down the dark slope. The experience is visceral — the acrid bite of sulphur in the air, the eerie silence broken only by the hiss of escaping gas, and the ghostly blue glow against absolute darkness. As daylight creeps in, the flames fade and the full scene reveals itself: a turquoise-coloured acid lake of pH 0.5, its surface ringed by brilliant yellow sulphur deposits and ash-grey crater walls. The lake's colour comes from dissolved sulphuric acid — one of the most corrosive natural bodies of water on Earth. Miners work the sulphur here at dawn, their silhouettes framing the otherworldly landscape. The combination of blue fire, acid lake, sulphur crusts, and volcanic steam makes this one of the most visually extraordinary geological spectacles accessible to visitors anywhere on the planet.
When to go
Jan — Dec, peak Apr — Sep
Getting there
Nearest airport: BWX. Nearest city: Banyuwangi.
Booking options
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