Several protected areas with unique natural features represent the core of the North Karelia Biosphere Reserve. They are mostly managed by Metsähallitus-Parks & Wildlife Finland.
Protected areas in North Karelia Biosphere Reserve:
- Koli national park
- Patvinsuo national park
- Petkeljärvi national park
- Koivusuo strict nature reserve
- Kesonsuo nature reserve
- Ruunaa nature reserve
North Karelia Biosphere Reserve is located in the westernmost part of the boreal coniferous forest zone, where the climate shows both continental and maritime characteristics. The sparsely populated area is characterised by large quantity of forests, mires, hills and water bodies. There are several lakes and ponds in the area, the largest lake is Koitere, and the longest river is Koitajoki with almost 200 km in lenght. Also wilderness-like nature is still found, especially in the largest protected areas.