The Madu River mangrove ecosystem near Balapitiya is a UNESCO Ramsar wetland site navigated by flat-bottomed boat through canopy that closes overhead into a green, bird-rich, entirely quiet world. Cinnamon island demonstrations, small temple islands, and monitor lizards on the mangrove roots make for a consistently absorbing boat safari. The Bentota River offers a calmer, more intimate complement to the open beach, excellent for sunset river cruises and riverside wildlife.