Jomblang cave is a vertical cave with dense ancient forest below. A 300 meter alley with its beautiful natural ornament will bring you to the edge of Gua Grubug (Grubug Cave), a place where you can see light from heaven.
Jomblang is one of hundreds of cave complex in Gunungkidul that becomes well known because of its uniqueness. In 2011, it is used as the object of a program called Amazing Race America. Located on the range of karst hills in the southern coastal spread along Gombong, Central Java up to karst area in Sewu Mountain, Pacitan, West Java, this vertical cave has collapse doline. It was constructed from a geological process when the land and its vegetation vanished into the bowel of the earth thousand years ago. The ruins formed a sinkhole, which in Javanese language was called sumuran or luweng. As a result, the cave which has 50 meter diameter was later named Luweng Jomblang.
The journey to get to the bottom of Goa Jomblang (Jomblang Cave) are indeed exhausting. Vertical steep path to reach the bottom of the Jomblang Cave requires bravery, especially for first timers. The cave horrible history indeed scares the local people. Many eerie stories come along with it. However, when we reached the bottom of the cave, all the fatigue and fear will be replaced by a sense of awe of the beauty of Jomblang Cave. Jomblang Cave is a vertical cave characteristics which diametrically 50 m wide with vertical sides varies between 60-80 meters. Because getting enough sunlight, at the bottom some trees grow exuberantly like an underground forest and on karst wall grow shrubs.
When we reach the bottom of the cave, we can take a rest for a while in a cubicle from natural phenomenon. After sort resting, explorers can continue the journey by tracing the tunnel that connects the Cave Jomblang with other vertical cave named Grubug. The tunnel is quite wide with a length of about 500 m. Is not difficult to pass the tunnel because there is a stone passageway. The both of cave is a cave that type of combination of vertical and horizontal cave.
If we can reach the bottom of Grubug at 01.00pm, the views of the sun through the eternal darkness at the bottom of the Cave Grubug would be so amazing. The ray has touched a number of stalactites and stalagmites formed by dripping water over thousands of years. Sunlight broke into the mouth of Grubug cave and one large stalagmite cave located at the bottom. On the north side of the huge stalagmites, there is the river flow that comes from Kalisuci.
Goa Jomblang and Grubug located in Semanu district, Gunugkidul Regency, 50 km southeast Yogyakarta, about 10 km from Wonosari (the capital of Gunungkidul regency). We suggested To reach Jomblang cave with use private transportation vehicle or motorcycle and will take about 2 hours drive from the city of Yogyakarta. Location of the cave was in middle of field rice by the way is quite challenging with rocks along the road to the location of the cave.
Sumber : https://www.yogyes.com/en/yogyakarta-tourism-object/nature-and-outdoor/gua-jomblang/