The Semi-marathon des 4 communes takes place in Cauvigny, located in France's Oise department, with several morning races scheduled for April. The event offers more than just a half marathon; participants can select from 5 km, 10 km, a 20 km trail run, or the 21 km semi-marathon. Additionally, there is a 10 km walking route available.
The 20 km trail run features the most elevation gain among the listed races, totaling 320 meters. This event connects four organizing communes: Cauvigny, Ully-Saint-Georges, La Chapelle, and Novillers. It also includes a 1.4 km children's race open to children residing outside these four communes. Entry fees are reasonable, ranging from 6 EUR for the children's race to 16 EUR for the trail run and the half marathon.