The Koggala Lagoon is one of rich bio diversities and eco systems in the southern coastal areas in Sri Lanka. The Lagoon is scattered with eight small islands.The islands consist of lush mangrove swamps. There are seven islands in the lagoon that can be reached by catamaran boat. Even many species of birds have immigrated to Koggala islands.The most famous of the islands is Madol Doova which is described in detail by Martin Wickramasinghe in his novel, Madol Doova. Kathaluwa Buddhist Temple (Kathaluwa Purvarama Maha Vihara) is one of the main tourist attractions in the lagoon with Kandyan-style paintings dated 19th century.