The Belum Caves is the largest and longest cave system open to the public in India at Andhra Pradesh ( Kurnool). The Belum Caves have long passages, galleries, spacious caverns with fresh water and siphons. This cave system was formed over the course of tens of thousands of years by the constant flow of underground water. The cave system reaches its deepest point ( 46 m (151 ft) from entrance level) at the point known as Pataalaganga.In Telugu language, it is called Belum Guhalu. Belum Caves have a length of 3,229 m (10,593.8 ft), making them the second largest caves on the Indian Subcontinent after the Krem Liat Prah caves in Meghalaya.