Grønfossen is a small but powerful waterfall west of Lesjaskog in the region Oppland, Norway.
West of Lesjakog (driving on road E136) there is a small road crossing the railway that is closed for cars (??I see a fence). Following the road brings you to the Grønfossen in 15-20 minutes (1,3 kilometers).
Grønfossen are actually several rapids after each other, but the highest is called Grønfossen and is appr. 8 meters high.