Borra Caves

The Borra Caves, also called Borra Guhalu, are located on the East Coast of India, in the Ananthagiri hills of the Araku Valley of the Visakhapatnam district in Andhra Pradesh. The caves, one of the largest in the country, at an elevation of about 705 m, distinctly exhibit a variety of speleothems ranging in size and irregularly shaped stalactites and stalagmites. The caves are basically karstic limestone structures extending to a depth of 80 m, and are considered the deepest caves in India.

Source: Wikipedia