According to Ramayana Sri Lanka was a huge continent. The early Indian astronomers established that the capital of Sri Lanka, as the equinoctial point in the universe. Rawana-Kotte [the great and little basses] is located off the southeast coast. This was one of Rawana's Fortresses, and an impregnable stronghold renowned for its seven concentric ramparts and parapet of brass. 

Maritime archaeological researchers have found a number of places and objects of archaeological and historical value from this zone which can be accessed by boat from Kirinda. The decision to proclaim this area a security zone was taken at a discussion held in last July between the Archaeological Department, Central Cultural Fund and Sri Lanka Navy. Legend says King Rawana had build fortresses at these locations which are submerged in the sea now.