The Ultra Trail des Sources (UTDS®) presents a rigorous challenge for endurance athletes in the picturesque Ardennes region of eastern Belgium. The highlight is an 80 KM course featuring a significant elevation gain of 2350 m+, connecting the charming towns of Spa, Theux, Stoumont, and Trois-Ponts. This demanding race invites solo runners and teams of 2 to 4, fostering a spirited relay atmosphere. Runners will experience breathtaking, unspoiled landscapes and the natural beauty of the Pays des Sources. A 42 KM option with a 1250 m+ elevation gain covers the latter section of the ultra course, while a shorter 18 KM route incorporates parts of the longer distances, providing a diverse trail experience for those eager to test their limits.