Kawah Ijen acid lake, Volcanic crater lake in East Java, Indonesia
The turquoise crater lake measures 722 meters in diameter and reaches a depth of 200 meters within the Ijen volcano complex.
The crater lake formed following volcanic activity, with its last magmatic eruption recorded in 1817 and multiple phreatic eruptions between 1796 and 2002.
Local miners extract sulfur from the crater, carrying loads of 75 to 90 kilograms while navigating steep paths under demanding conditions.
Visitors need to hike at night to observe the electric blue flames caused by burning sulfur gases escaping from volcanic conduits.
The lake contains 27.5 million cubic meters of water with a pH of 0.3, making it the largest highly acidic crater lake on Earth.
Elevation above the sea: 2,200 m
Part of: Ijen
Address: Kawah Ijen, East Java, Indonesia
GPS coordinates: -8.05750,114.24150
Latest update: March 20, 2025 19:35
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