The morning view of hills surrounding Mount Ijen. The mountain is meters above sea level and has a caldera measuring 22 by 25 kilometers, the Ijen volcano is world famous for its crater lake with the most acidic water in the globe.
The crater of Mount Ijen can only be reached by foot. Besides a view of biodiversity, if lucky, tourists can also catch .
The Ijen crater boasts a magnificent crater lake, which is over 182 meters deep and has 32 million cubic meters of beautiful turquoise green water. The high acidity of the water gives it a unique, bitter flavor.