The Apennine Mountains (also known as Apennines) are a mountain range consisting of parallel smaller chains extending 750 miles (1,200 km) along the length of peninsular Italy.
The Heroes of Olympus[]
The House of Hades[]
The earth spirits, Ourae, attack the Argo II from the mountains, which prevents the six aboard the ship to cross the mountains. The crew of the ship had previously tried to cross the mountains for two days but had been unsuccessful. The six aboard the Argo II are then forced to turn away from the mountains in hopes of coming up with a new plan.