The Madu River estuary near Balapitiya is one of Sri Lanka’s most ecologically precious landscapes, a labyrinthine world of 64 islands and islets connected by glassy channels fringed with ancient mangrove forests that shelter an astonishing diversity of life. A traditional wooden boat glides you silently through this liquid maze as your guide points out monitor lizards draped over branches, purple-faced langurs peering through the foliage, and the darting electric-blue flash of common kingfishers. Stop at a cinnamon island where farmers peel the fragrant inner bark by hand, a living spice garden adrift on the river, and a tiny fish therapy island where freshwater fish nibble dead skin from your feet in a natural wellness ritual that’s as surprising as it is delightful. The tour culminates at a sea turtle conservation centre where rescued green, loggerhead, and olive ridley turtles are nursed back to health.