History of Pindul Cave 

Pindul cave is the cave that tells the story of Joko Silunglung who is looking for his father. While exploring the 7th cave which has a river flowing underneath, Joko's head hit a large rock inside the cave. Then the cave where Joko hit it was named Goa Pindul which comes from the word pipi gemebendul which means a cheek that was hit.

Geology of the Oya River 

The Oya river is a periodic river that flows between the northern and southern karst hills with a suspended load flow.