Lastly, and by no means least, is the iconic Ultra-Trail du Mont-Blanc. Informally known as the UTMB, this difficult and striking race takes on the original Trail du Mont-Blanc. Runners will take on 170km with over 10,000m of ascent with a maximum cut off time of 46.5 hours.
Described as one of the toughest ultra-marathons in the world, runners are expected to begin the race with a good level of experience and the mandatory kit list for some unpredictable and often extreme weather.
Starting at 6pm in Chamonix square and ending in Chamonix some 20, 30 or 40 hours later, this race is the most iconic of them all.