The Saint Hilarion Castle lies on the Kyrenia mountain range, in Cyprus. This location provided the castle with command of the pass road from Kyrenia to Nicosia. It is the best preserved ruin of the three former strongholds in the Kyrenia mountains, the other two being Kantara and Buffavento.

The Kyrenia Mountains is a long, narrow mountain range that runs for approximately 160 km (100 mi) along the northern coast of the island of Cyprus. It is primarily made of hard crystalline limestone, with some marble. Its highest peak is Mount Selvili, at 1,024 m (3,360 ft). Pentadaktylos is another name for the Kyrenia Mountains, though Britannica refers to Pentadaktylos as the "western portion" of the latter, or the part west of Melounta. Pentadaktylos is so-named after one of its most distinguishing features, a peak that resembles five fingers.