Enchanting Blue Flames of East Java
Mount Ijen, located in East Java, is famous for its otherworldly blue fire phenomenon, acidic turquoise crater lake, and sulfur mining activity. Standing at 2,799 meters, it is one of the most unique volcanic hikes in the world.
The blue flames, caused by ignited sulfuric gas, are one of only two places in the world where this occurs naturally (the other being in Iceland). The sight of miners carrying heavy sulfur blocks on their backs adds to the raw, rugged atmosphere of this trek.
Guide recommended
Popular Route: Night Hike to See Blue Fire
Duration:4-5 hours round trip (night trek + sunrise view).
Key Experiences
Blue Fire Phenomenon (1:00 AM - 4:30 AM)
Glowing electric-blue flames rise from the crater floor due to burning sulfuric gases.
Ijen Crater Lake
Largest acidic crater lake in the world—its milky turquoise waters create a surreal landscape.
Sulfur clouds often hover above the lake, adding to the dramatic scenery.
Witnessing the Sulfur Miners
Local miners extract solidified sulfur by hand and carry up to 70-90kg on their backs.
A glimpse into one of the harshest jobs in the world.
Sunrise Over the Caldera
Golden sunrise light reflects off the crater lake, creating stunning contrasts.
Best Time to Visit
May to October (Dry Season) – Best weather and visibility.
Avoid Rainy Season (November to April) – Slippery paths and poor visibility.
Physical & Technical Preparation
Moderate fitness level required – Steep 3km uphill hike.
Descent into the crater can be dangerous – Loose rocks and sulfur gas exposure.
Essential Gear
Gas mask – Toxic sulfur fumes are strong inside the crater.
Headlamp – The hike starts in total darkness.
Trekking shoes – Uneven and steep terrain.
Warm layers – Cold temperatures in the early morning.