Proper noun
the Apennine Mountains
The Apennines.
Expansion Etruscan expansion was focused both to the north beyond the Apennine Mountains and into Campania. Source: Internet
On September 18, Vietinghoff realized that the game was up and directed his forces to withdraw northward to the Apennine Mountains. Source: Internet
Etymology The term "gabbro" was used in the 1760s to name a set of rock types that were found in the ophiolites of the Apennine Mountains in Italy. Source: Internet