The Cross du Mont Blanc gives less hardcore runners the chance to compete over a similar course, which is just half the distance of the marathon.
At 23kms the route has a total ascent of 1665m and descent of 621m, so it is still a mighty challenge.
Starting down in the Chamonix valley, the Cross follows the same route to Argentière and Montroc as the Marathon, but then takes a more direct path to the Charlenon Coomb before finishing at Plan Praz. The height gain and off-road terrain make the completion of this half-marathon a massive achievement for any amateur runner.
There's an adults race and one designed just for the kids too. Take a look at the website for more information, how to register or just come along and cheer on the runners!