On Sunday, July 12, 2026, the city of Versailles will host its very first Ironman 70.3. This 113-kilometer triathlon will see competitors swimming across the Pièce d’Eau des Suisses, cycling through the picturesque Chevreuse Valley, and finishing with a run through the historic Potager du Roi, culminating in a spectacular finish right in front of the Chateau.