Madu Ganga National Ramsar Wetland is a coastal wetland formed by the Madu Ganga, located in Balapitiya on the southwestern coast of Sri Lanka.

Surrounded by lush mangrove forests, small islands, and abundant wildlife, Madu Ganga was designated as a Ramsar Wetland of International Importance in 2003.

Madu Ganga is Sri Lanka’s largest remaining mangrove swamp, home to a variety of aquatic plants, crabs, shrimps, fish, bird species, and crocodiles.