The Ijen Volcano and Its Acidic Lake

Ijen Carter is one of the crater lakes located in the top of Mount Ijen at 2386 meters above sea level with the depth reaches 200 meters and the width reaches 5466 hectares. The Ijen Crater is also the world’s largest acidity with the acidity level which is close to zero that even can melt the human body. The cause of its acidity is an inflow of hydrothermal waters charged with gases from a hot magma chamber below.


ijen volcano and its acidic lake Image Source: Flickr


Indonesia’s Kawah Ijen Volcano, on the island of East Java, has two of the most unusual occurrences on Earth. The first is an active solfatara that emits hot, flammable sulfurous gases. These ignite as they enter Earth’s oxygen-rich atmosphere and burn with an electric blue flame. The flames are difficult to see during the day but illuminate the landscape at night. The second occurrence is a one-kilometer-wide caldera lake filled with turquoise-blue water. The colour of the water is a result of its extreme acidity and a high concentration of dissolved metals.


ijen blue fire early in the morning


Ijen crater lake is also famous for its sulphur miners. Sulphur miners start working around two o’clock in the morning only to finish at around 11 o’clock. Twice, or three times a day the miners climb out of the crater up to the rim with a weight of around 80 kilograms on their shoulders.


kawah ijen sulfur miners


Tourists can enjoy the mountainous nuance as the main attraction for visitors. Not only enjoying the beautiful sunrise from the Ijen Carter, but also to witness directly the natural “blue fire” phenomenon in Ijen Carter. This phenomenon only happens in early morning until 5 PM. Tourists can also enjoy other scenery site, such as natural phenomenon of greenish blue color in Crater Lake as well as to see the process of sulfur mining.

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