Hainich National Park

50 km² is the largest unused deciuous forest area in Germany.

By the way, this space is found in the Hainich National Park in the very center of Germany. The park belongs to the Unesco World Heritage Site “Ancient and Primeval Beech Forests of the Carpathians and Other Regions of Europe”.

Source: https://de.wikipedia.org/wiki/Nationalpark_Hainich