Segara Anakan is a large lagoon located in the south-western part of Central Java (108046’–109005’E; 7034’–7048’S), west of Cilacap city, fringed by only large estuarine-mangrove forest left in Central Java. The lagoon is connected to the Indian Ocean by the western outlet (Plawangan Barat) and a tidal channel towards Cilacap as an Eastern outlet, and is protected from the open ocean by the rocky mountainous island Nusakambangan. The western part of the lagoon receives a high input of freshawater from Citanduy River, Cibereum River and Cikonde River, while the eastern part of the lagoon receives a low input of freshwater from short and small freshwater rivers, i.e. Sapuregel River and Donan River.
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