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Sonny Tumbelaka

The crater of Indonesia’s Kawah Ijen volcano puts on a particularly stunning light show thanks to the emission of sulphur. Seeping through cracks in the volcano, the superheated gases ignite when they contact air, bursting to life in a vibrant azure blaze.

Sulphur combusts on contact with air to create stunning blue lava-like rivers of light in the Kawah Ijen crater on the island of Java.

A farmer works in a field as Mount Agung looms in the background on Friday.

Ash-filled clouds rise from Mount Agung on Sunday.

Young people put on masks to protect themselves from ash in the air.