The forest gets its name from the hilly terrain in the area. The highest point is 85 meters high, at the burial mounds Svinhøjene, but only 1 km away the terrain descends to almost 0 meters at the base of Gravlev Valley.
The forest ranges in forest diversity, from tall pines in some areas, to younger deciduous forest areas, to ancient, twisted and gnarled beech forest. The twisted and often multi-stemmed beeches tell the story of poor growth conditions and exploitation of the forest. When the state took over the care of the forest, due to tax debts in 1826, the forest was in very poor condition. Fortunately, today the forest stands picturesque with beautiful natural scenery.
Beech trees around 200-300 years old, encircle the fence guarding one of the pearls of the forest, the Lady Slipper Orchid. The orchid is Northern Europe’s largest and rarest orchid, and unfortunately needs to be protected by the fence, to prevent poaching. The forest is the only place in Denmark where visitors can view the orchid.
The Lady Slipper orchid blooms in the end of May/start of June, so this is a perfect time to visit the forest. Moreover, at this time, the whole forest will be lush and green.
However, if you come earlier you can find blue anemone blooming and if you come during July another rare orchid is blooming, namely the red helleborine.