Top Attractions In Tour. -Cinnamon Island -Madu River fish therapy -Kothduwa Temple -Travel through the mangrove forest -Sathapaha Duwa island -Aquatic plants, crabs, shrimps, fish, insects, amphibians and other animal species including the crocodile. The estuary of the Madu Ganga river is a complex coastal ecosystem of mangroves and islands. It may be one of the last remaining tracts of pristine mangrove forests in Sri Lanka. A boat trip is a wonderful way of seeing some of the hundreds of species of plants and animals – monkeys eat fruit in the trees, a water monitor lizard glides slowly through the water, and cormorants, egrets and kingfishers wait patiently on the banks, eyeing the water for prey. There are around 64 islands in the river and lagoon, from a tiny speck housing a deserted shrine to one housing 250 families connected to the mainland with a very long footbridge world.