The GTR Marathon takes you from Vestlia into the open mountain landscape around Geilo. The course begins with a gentle stretch along Ustedalsfjorden before climbing toward Birgithovda and Ustetind. At approximately 18 km, you reach the first aid station at Tuva Turisthytte. From there, the route continues toward Vibu before turning back toward Birgithovda. You’ll find another aid station after the 30 km mark, followed by the aid station at Hakkesetstølen at approximately 39 km. The final stretch takes you across the mountain before a fast descent down the ski slopes to the finish at Vestlia.