Much of the landscape is near-natural, especially the around the river, but also parts of the Pfahl with its pine and birch stands. Otherwise grassland dominates, while the hillsides are mainly covered with spruce. The original beech and fir forests have been reduced to small remnants between the farmland and grassland on steeply sloping terrain. Most of the Regen Depression lies within the Bavarian Forest Nature Park, the northwestern part belongs to the Upper Bavarian Forest Nature Park.