349 he.
The Zelsva Botanical and Zoological Reserve protects typical communities of broad-leaf forests with hornbeam characteristic to Southwestern Lithuania: Hornbeam, swampy deciduous forests, alluvial forests habitats of the European Community importance and The finding places and habitats of the protected species (Hedera helix, Hordelymus europaeus, Vicia dumetorum, Euphydryas maturna).