Vallées-en-Champagne is in the southeastern part of the Aisne department, on the border with the Marne department, at 64.6 km (40.1 mi) to the south of Laon,[2] the prefecture of the department, and at 16.8 km (10.4 mi) to the southeast of Château-Thierry,[3] the subprefecture of the arrondissement.
It has an area of 41.24 km2 (15.92 sq mi) with an altitude of 82–254 m (269–833 ft).
↑"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.