Borra Caves Overview
Borra Caves are located about 90 kms. north of Vishakapatnam in the Ananthgiri Hill Ranges of Eastern Ghats of India. It falls in the State of Andhra Pradesh. William King, the British geologist discovered the cave in 1807. It is a naturally formed cave believed to be 150 million years old. The Humic acid in the water reacts with the Calcium Carbonate in the limestone and dissolves the minerals breaking the rock gradually.
The perennial water flow over millions of years resulted in the formation of the caves. The water percolating from the roof of the cave containing calcium bi-carbonate and other minerals form mounds on the cave ground called "Stalagmites" and spear like structures hanging from the roof called "Stalagcites." The total length of the Borra Caves is about 200 meters and the Dandakaranya - Bolangir - Kibur train track passes over the caves. The local hill tracts are inhabited by the Jatapu, Porja, Kondadora, Nookadora etc. tribals. Indian Anthropologists have also found stone tools of middle Paleolithic Age dating back to 30000 to 50000 years indicating human habitation in the caves.