The right to roam (“allemannsretten”) is a traditional right from acient times, and from 1957 it has also been part of the Outdoor Recreation Act. It ensures that everybody get to experience nature, even on larger privately owned areas.

There is public rights law in Norway called allemannsrett or “all men’s rights” which gives residents the freedom to roam through all uncultivated land for outdoor sports opportunities and others.

Source: https://www.visitnorway.com/plan-your-trip/travel-tips-a-z/right-of-access/