View of the Puys Chain, Puy de Dôme summit. The Chaîne des Puys is a north-south oriented chain of cinder cones, lava domes, and maars in the Massif Central of France. The chain is about 40 km (25 mi) long, and the identified volcanic features include 48 cinder cones, eight lava domes and 15 maars and explosion craters. Scientific community agrees on saying that there might be a future volcanic activity.