Mount Ijen is a volcano located on the border of Banyuwangi Regency and Bondowoso Regency, East Java, Indonesia. This mountain has a height of 2,386 meters above sea level and is located side by side with Mount Merapi. Mount Ijen last erupted in 1999. One of the most famous natural phenomena of Mount Ijen is the blue fire in the crater located at the top of the mountain. Climbing this mountain can be started from two places, namely from Banyuwangi or from Bondowoso.
Ijen Crater is an acidic crater lake located at the top of Mount Ijen with a lake depth of 200 meters and a crater area of 5,466 hectares. Ijen crater lake is known to be the largest strong acid lake in the world. Ijen Crater is located in the Ijen Tourism Park Nature Reserve, Bondowoso Regency and Banyuwangi Regency, East Java. The phenomenon of the eternal blue fire or eternal blue fire is inside the Ijen crater, and this natural sight only occurs in two places in the world, namely Ethiopia (Mount Dallol) and Ijen.
Blue fire can only be seen by the human eye when there is no light, so the ideal time to see it is 2 to 4 in the morning, because climbing Mount Ijen only starts at 2 in the morning. From Ijen Crater, we can see other mountain views in the Ijen Mountains complex, including the peak of Mount Marapi which is east of Ijen Crater, Mount Raung, Mount Suket, and Mount Rante.
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