volcanic cone of Ijen dominates the landscape in the eastern part of Java. Ijen crater is filled with spectacular turquoise blue lake, its surface streaked in wind patterns and sulfur yellow.

Ijen is the world's largest highly acidic lake and is the site of a sulfur mining workforce in which sulfur-laden baskets are hand-carried from the crater floor.

Many other post-caldera cones and craters are located within the caldera or along its rim. The largest concentration of post-caldera cones forms an EW-trending zone across the south side of the caldera. Coffee plantations cover much of the ground Ijen Caldera, and tourists attracted by its waterfalls, hot springs, and dramatic volcanic landscapes.

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