Bükk's important geological features include various karst formations within its limestone mountains - particularly caves (once inhabited by pre-historic people), swallow-holes, and ravines.

Bükk National Park also contains ninety species of nesting birds, some considered endangered.

[1] The Vatican Climate Forest was to be located within the Park.

KlimaFa ("Climate Trees") was started by a San Francisco promoter, Russ George, who promised a carbon offsetting project, intended to offset the Vatican's carbon dioxide emissions.

In an interview with the Christian Science Monitor, Lajos Kiss, mayor of the village of Tiszakeszi pointed out an empty area along the Tisza River where the trees were supposed to be planted.