In Alterberget mountain´s spruce forest there also grow thick aspen and willow. The air humidity is high. That favours Lungwort, which here unusually grows on spruce. There are several trails to hike on in the area, which covers 0.5 square kilometres and has a snowmobile ban.
Alterberget lies about 5 kilometres northwest of the village of Måttsund. From the E4 turn off at Måttsundsronningen and continue past a gravel pit. The same road can also be reached from the east, near Gäddvik.