Goa Jomblang

Goa Jomblang is a vertical collapse-doline cave located in Jetis Wetan, Pacarejo, Semanu, Gunung Kidul Regency, Special Region of Yogyakarta, Indonesia. Formed by the collapse of limestone land, it features a 50-meter deep vertical shaft leading to an ancient forest and a horizontal tunnel connecting to Goa Grubug. It is famous for the 'Light of Heaven' sun rays penetrating the cave, and is part of the Gunung Sewu UNESCO Global Geopark.

Visitors can expect a managed adventure caving experience starting with a vertical descent of about 50-60 meters using single-rope technique with harnesses and guides. At the bottom is a collapse doline with dense ancient forest vegetation, then a 250-meter horizontal muddy trek through a tunnel to Goa Grubug where vertical shafts allow dramatic sunbeams known as 'Cahaya Surga' or Light of Heaven to illuminate the dark chamber. The setting is natural karst forest and limestone cave with no artificial lighting.