Belum Caves

is the second largest cave in Indian subcontinent and the longest caves in plains of Indian Subcontinent, known for its stalactite and stalagmite formations. Belum Caves have long passages, spacious chambers, fresh water galleries and siphons. It is a natural underground cave formed by the constant flow of underground water. The caves reach its deepest point (150 feet from entrance level) at the point known as Pataalaganga. Belum Caves derives its name from "Bilum" Sanskrit word for caves. In Telugu language, it is called Belum Guhalu. Belum Caves has a length of 3229 metres, making it the second largest natural caves in Indian Subcontinent.

Belum Caves are geologically and historically important caves. There are indications that Jains and Buddhists monks occupied these caves centuries ago. Many Buddhists relics were found inside the caves. These relics are now housed in Museum at Ananthapur.
Archaeological survey of India (ASI) also found remnants of vessels, etc. of pre-Buddhist era and has dated the remnants of vessels found in the caves to 4500 BC.