Puy de Sancy (US: /ˌpwiː də sɒ̃ˈsiː/, French: [pɥi d(ə) sɑ̃si]; Auvergnat: Puèi de la Crotz [ˈpœj də lɔ ˈkɾu(ts)], lit. ''Mount of the Cross'') is the highest mountain in the Massif Central. It is part of an ancient stratovolcano which has been inactive for about 220,000 years.