The High Fens cover an area of approximately 4500 hectares and are part of the Ardennes-Eifel Mountain range, which extends across Belgium, Germany, and Luxembourg.  The landscape is characterized by rolling hills and high-altitude raised bog that is the most intact of its kind in West-Europe. The unique ecosystem is home to a variety of endangered species such as sundew and wolves, as well as numerous deer and wild boars. A variety of bird species can be heard specially during the dawn chorus in spring.
It has been inhabited since the Neolithic period, followed by Celts and Romans, and played an important role in the Battle of the Ardennes during WW II. Today it remains one of Belgium’s few nature reserves and conserves its largest drinking water reservoirs.
The protected bogs and marshes absorb sound, creating a unique and almost otherworldly, silent soundscape, occasionally interrupted by the sound of a distant car or airplane. This makes it an ideal destination for those interested in listening to acoustic ecology.

More Info: https://www.ostbelgien.eu/en/what-to-do/destinations/high-fens/everything-you-need-to-know-about-the-high-fens