The Borra Caves are located about 90 kms North of Visakhapatnam (Vizag), in the Ananthagiri hills range of the Eastern ghats in Andhra Pradesh. William King the British geologist discovered the caves in 1807. Borra (which means hole in Oriya) caves are naturally formed and believed to be 150 Mllion years old. The main entrance of Borra Caves is at an altitude of 705 meters while the interior goes to a depth of 625 meters. The total length of the caves is about 200 meters.