In the Koivu-Lambasuo wildlife area (61 48_ N, 33 35_ E) three raised ridgehollow bogs and one southern aapa-type mire, known as Nenazvannoye Mire, cover 2000 ha. The raised bogs have fairly monotonous vegetation, whereas Nenazvannoye Mire displays highly diverse flora, vegetation and mire facies (sites) ranging from oligotrophic to eutrophic types. Aapa mires predominate in Fennoscandian landscapes. Aapa-type Nenazvannoye Mire lies at the southern boundary of the area where this type of mires is ubiquitous. As a result of long-term (1975-1997) mire studies carried out in the wildlife area, 141 vascular plant species and 58 mosses species that account for 1/2 of entire Karelia mire flora were revealed (Cf.: Maksimov, 1988; Kuznetsov, 1989). The largest number of species was reported from Nenazvannoye Mire. Carex disticha, C. livida, Cypripedium calceolus, and Dactylorhiza traunsteineri are now in the Red Book of Karelia (1995). Sphagnum subfulvum and S. lindbergii are very rare because these species occur at the southern boundary of the continuous area. Vascular plant - mosses ratio is 2.9:1 for Karelian flora (Volkova, 1977), 2.7:1 for Karelian mires and 2.4:1 for mires in the Koivu-Lambasuo wildlife area. The data obtained have led the authors to conclude that the mire flora of the Koivu-Lambasuo wildlife area, which includes some "Red Book species", is fairly representative and diverse. The mires of the Koivu-Lambasuo wildlife area are second to those of the Kivach Reserve in terms of flora diversity (Cf.: Maksimov, 1995; Kravchenko et al., 1997) and are, therefore, highly important for preservation of biodiversity.