The Site in the Lake District of Finland is representative of the mire vegetation region with its eccentric bogs, oligotrophic pine bogs and poor fens, and Sphagnum fuscum raised bogs. The mires are restricted to the unmodified River Naarajoki with its rich alluvial meadows and dense growths of yellow flag iris (Iris pseudacorus). Pohjalampi is a small lake in the south of the Site, characterized by extensive growths of water horsetail (Equisetum fluviatile) and sedge meadows on its shores. Several species listed for protection in the EU Birds Directive Annex I breed in the area, including European honey buzzard (Pernis apivorus), horned grebe (Podiceps auratus), common tern (Sterna hirundo), golden plover (Pluvialis apricaria) and wood sandpiper (Tringa glareola). The Site also provides habitat for European otter (Lutra lutra) as well as the green snaketail dragonfly (Ophiogomphus cecilia). Drainage ditches have diminished the natural condition of some mires in the eastern area of the Site, and there is a canoe route on River Naarajoki, but there are no significant land use activities or visitors, so the Site remains undisturbed for wildlife.