The Birken Fjellmaraton offers a unique and demanding 42.2-kilometer course that begins at the Sjusjøen Cross-Country Arena, renowned for its world-class skiing and biathlon facilities. Runners face a challenging ascent with a total elevation gain of 563 meters, followed by a significant descent of 1159 meters, testing both their climbing abilities and downhill running skills. The route takes participants through some of Norway's most stunning mountainous landscapes, providing an unforgettable experience of running in the heart of nature. This marathon is not just a race; it's an adventure, attracting those who seek to push their limits and enjoy the beauty of the rugged Nordic terrain. The combination of challenging elevation changes and the spectacular natural setting makes the Birken Fjellmaraton a must-do event for serious marathon runners and trail enthusiasts.