As is the case for many other Indonesian islands, volcanoes have played a vital role in the geological and human history of Java.
Volcanoes are a major contributor to the immense fertility of Java, as natural erosion transports volcanic material as alluvium to the island's plains, forming thick layers of fertile sediment.
The benefit is not just in the immediate vicinity of the volcano, with fine ash emitted from eruptions being dispersed over wide areas.
Climbing volcanoes (and other mountains) is increasingly popular.
Local terminology and usage has the word Gunung (mount or mountain) precede the names.