Do you know the difference between the Bouviers Battery and the redoubt? Do you know that an Australian aviator crashed in Guyancourt? Discover the historical and natural heritage of Guyancourt. A 10km loop is proposed to discover the local history as well as the fauna and flora of the ponds of La Minière… running or hiking! In partnership with the Amicale Laïque associations of Guyancourt, the Association de Sauvegarde des Etangs de la Minière, and the Ligue de Protection des Oiseaux. Runners start at 9 am (estimated time: 1 h 30), hikers start at 2 pm (estimated time: 3 am). Head to the forecourt of the Maurice-Baquet gymnasium, rue des Graviers.