massif

/mæˈsif/
noun
  1. A large, compact mountain range or a block of the earth's crust that is higher than the surrounding area.
    • Hikers explored the granite massif, which rose steeply from the valley floor.
    • The massif was formed millions of years ago by volcanic activity and tectonic shifts.
    • The Mont Blanc massif is the highest mountain range in the Alps.