Kawah Ijen — Blue Fire & Sulfur Hell★★★
The Kawah Ijen at the eastern tip of Java offers a double spectacle: one of the most beautiful crater lakes in the world — turquoise, one kilometer wide, filled with sulfuric acid — and a surreal natural phenomenon found only in two places on Earth: the Blue Fire.
The Blue Fire occurs when sulfur gases escape from the fumaroles and ignite upon contact with the air. The flames glow in ghostly blue, up to five meters high, and are only visible in complete darkness — that's why the hike begins at one o'clock at night.
The ascent to the crater rim (2,386 m) takes about 90 minutes. Then you descend on a slippery path into the crater — amidst sulfur fumes that take your breath away. There work the sulfur miners of Ijen: men who daily carry 75–90 kilograms of sulfur blocks in baskets on their shoulders up the steep crater and 3 kilometers down to the weighing point — for the equivalent of €8–12 a day. Many have no respirators. Life expectancy is short. It is an image that burns into the soul and raises the question of the price at which our cheap products are made.
At sunrise, the crater lake transforms into an unreal turquoise — the largest highly concentrated sulfuric acid lake in the world. The contrast between the toxic fumes, the glowing lake, and the golden morning light is disturbingly beautiful.
💡 Tipp
Combine Bromo and Ijen in a 2-day tour from Surabaya or Banyuwangi. Many tours offer the night-for-night variant: Bromo sunrise → transfer → Ijen Blue Fire the next morning. Exhausting but unforgettable.
Achtung
The sulfur fumes in the crater are hazardous to health! Be sure to bring a respirator (available at the parking lot for 30,000 IDR / €1.80, or better: your own activated carbon mask). People with asthma or heart problems should not descend into the crater. The descent is steep and slippery — sturdy shoes are mandatory.
