Ratnadurg Fort is encircled by the Arabian Sea from three sides. The dimensions of the horseshoe shaped fort are 1300 m length and 1000 m width. A lighthouse named as the Siddha lighthouse is situated at one of the bastions. A fort which is surrounded by the Arebian Sea from three sides. The fort is having a shape of Horse Shoe and a length approximately 1300 m and width 1000m. Its having strong fortifications from south-east to west side.