Les Septvallons is in the eastern part of the Soissonsarrondissement, in the valley of the Aisne river; the commune is on the border with the Marne department, at 23.5 km (14.6 mi) to the south of Laon,[2] the prefecture of the department, and at 23.8 km (14.8 mi) to the east of Soissons,[3] the subprefecture of the arrondissement.
It has an area of 38.14 km2 (14.73 sq mi) with an altitude of 55–193 m (180–633 ft).
Longueval-Barbonval and its neighboring communities
↑"Populations lègales 2013 - 02-Aisne". Populations légales 2013 des départements et des collectivités d'outre-mer (in French). Institut national de la statistique et des études économiques - INSEE. Retrieved 2 November 2016.