The Ultra Marathon des Crètes Senesi is a trail event held in Rapolano Terme, close to Siena in Tuscany, typically in early May. Participants can select from 15 km, 30 km, or 50 km trail runs. The 10 km option is designated as an Eco-Marche walk. The 50 km route, the most popular, features 800 metres of elevation gain, offering a challenging ultra distance without becoming a mountain race.
All four distances feature single-loop courses, directing participants through varied terrain rather than repeated laps. The 30 km course includes 400 metres of climbing, the 15 km has 250 metres, and the 50 km extends this format across the Crete Senesi landscape. The courses traverse the Tuscan countryside, incorporating forests, castles, vineyards, and historical locations within the race environment.