Part of an extensive wilderness area in north-western Estonia, Leidissoo consists of a variety of mire types and habitats of Europe-wide interest, and plays a significant role in the hydrological balance of the region. Open fens are prominent, while in the western area of the Site bog communities can also be found. Leidissoo is one of the few such habitats in Estonia that are maintained in their natural state rather than being drained, and so the wetland supports plants and animals which are important for the biogeographical region. These include many bird species listed under the European Birds Directive Annex I, including the black stork (Ciconia nigra), corncrake (Crex crex) and black grouse (Lyrurus tetrix), while the Site provides breeding grounds for other species such as the common snipe (Gallinago gallinago), of which 200 pairs have been recorded. Traditional berry and mushroom picking, as well as small-scale hunting, are practiced. Threats include the intensification of forestry and the drainage of surrounding areas.