Most part of the mountains are under protection as Bükk National Park. The Bükk massif is the largest karstic region of Hungary with numerous stream caves and potholes. It comprises a forested highland area dissected by valleys of the Sajó and Tisza rivers. The National Park is undoubtedly a paradise for nature lovers. On the lower sections of mountain slopes there are flourishing vineyards and orchards. The forests and hills of the Bükk are home to many kinds of animals, especially a wide diversity of birdlife.
There are 1115 known caves in the mountain range, including István-lápa, the deepest cave in Hungary (254 m), the Cave Bath, the archeologically important Szeleta Cave, the Anna Cave, and the István Cave. 52 of the caves are protected because of their fauna and microclimate. The Szeleta Cave have preserved traces of the pre-historic men. The fine tools discovered there are dated back to the ice-age period.
The Bükk Mountains are very popular among Hungarian and foreign visitors longing for mountain recreation.