All 4 Extra-trail tracks in the mystic muddy Ardennes in the heart of Belgium: 4 loops, 30k-21k-14k-7k, reunited in one track. That's what the Stoumont Grand Slam is all about. This also means you start and arrive 4 times at the Stoumont central ExtraTrail hub, and run some sections several times. All four routes must be run completely.
