Les Septvallons is in the eastern part of the Soissons arrondissement, 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, the prefecture of the department, and at 23.8 km (14.8 mi) to the east of Soissons, 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).
Les Septvallons is in the eastern part of the Soissons arrondissement, 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, the prefecture of the department, and at 23.8 km (14.8 mi) to the east of Soissons, 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).
Les Septvallons