A student from the University of Indonesia descends into Jomblang cave at Gunungkidul district, near the ancient city of Yogyakarta, on June 20. Jomblang cave is one of the hundreds of caves in the Gunungkidul district. Jomblang is known for its fertile and dense vegetation and is located at the karst hills that run along Central Java to West Java provinces.

A student from the University of Indonesia sits near a karst stone inside Jomblang cave at Gunungkidul district, near the ancient city of Yogyakarta, on June 20.