Padurea Craiului is a European protected area that hosts 37 species of European interest, and over 16 habitats. Thanks to the karst rocks, which reflect the sunlight, this area has several rare species of plants. The major attraction in this area is caves. They shelter major bat colonies.
All the caves in Padurea Craiului shelter bat colonies.
In the north-west of Apuseni Nature Park is the Padurea Craiului Mountain, which is a carstic mountain and a huge territory with peaks, valleys, caves and underground channels, carstic plateaus, waterfalls.
Padurea Craiului has the largest plateau-type karst in the Apuseni Mountains developed at about 500–600 m altitude with numerous karst features as karren, dolines, ponors, springs, and caves.