The Finnish Natural Heritage Foundation purchased two forest areas, Takkula and Aittopää, located next to each other by Lake Aittojärvi in the Korttee village of Jämsä. Its forests of many trees are standing at the foot of a mountain with the same name as well as its northern and northwestern slopes. The lowest section of the brook connecting the lakes Rotkojärvi and Aittojärvi remains inside the conservation area together with approximately one kilometre of the valuable shore.

The forest, which is a hundred years old to a great extent, or even older, is directly connected to the three-kilometre long conservation area already established there around Lake Rotkojärvi and a ravine that faces towards the southeast. The old conservation area is also valuable, not only because of its landscapes, but also due to the vegetation of its forests and rocks. There are demanding species of moss, lichen, and vascular plants appearing in the area. At the foot of the cliff, which reaches the height of approximately forty metres from the lake, the touch-me-not balsam appears in the rocky terrain with groves flourishing by the brook. The eagle-owl, the black woodpecker, and the hazel chicken are known to have nested in the area. The flying squirrel has also been detected.

This new conservation area acquired by the Finnish Natural Heritage Foundation will offer these and many other species new living environments and make the nature types of the area more diverse. On the side of the Rotkovuori conservation area, an old heath forest stands out with its dominating spruces and decayed wood in great amounts.