The versatility of Finnish water nature is beyond comparison in the world. The first episode of Worlds of Water follows water’s journey from brooks to lakes and mighty rivers to the sea. Petteri and Antti travel from the sources of water on brooks, rapids and lakes all the way to the open sea, showing the fascinating nature of Finnish waterways. Natural waters are the veins that keep Finland alive and all life intertwines with the eternal circulation of water. As seasons and forms of water change we meet both familiar and rarer water inhabitants, including otters, beavers, grey seals, goosanders and European dippers. Petteri and Antti even find the extremely endangered common kingfisher and an exotic visitor, the mandarin duck.