The Apuseni Mountains is a mountain range in Transylvania, Romania, which belongs to the Western Romanian Carpathians. The highest peak is the Bihor Peak at 1,849 metres (6,066 ft). The Apuseni Mountains have about 400 caves.

Transylvania is a historical and cultural region in Central Europe, encompassing central Romania. To the east and south its natural border is the Carpathian Mountains and to the west the Apuseni Mountains. Broader definitions of Transylvania also include the western and northwestern Romanian regions of Crișana and Maramureș, and occasionally Banat. Historical Transylvania also includes small parts of neighbouring Western Moldavia and even a small part of south-western neighbouring Bukovina to its north east. The capital of the region is Cluj-Napoca.