The park thus also includes areas with undisturbed birch forest in addition to the mountains.

Inside the area was originally only a birch forest, while outside the rampart ash trees were abundant.

The treeline, with a light birch forest, rises to about in sterdalen.

Birch forest occupies 10% of the wooded area and aspen forest take up 2%.

The fenced-in basins returned to a natural state, becoming home to a birch forest and grassy marsh and hosting a wide variety of flora and fauna.