The pristine fens in the Donderslag walking area are enchantingly beautiful and hotspots for biodiversity. Their pure and nutrient-poor water is home to dragonflies, moor frogs, and countless water animals. They are also important resting places for migratory birds to regain their strength. De Ranger is happy to introduce you to these pearls and shed light on their secrets. Practical : Date : Sunday, June 7 Starting location : Joekelbos parking lot Address : Speeltuinstraat, 3660 Oudsbergen (Opglabbeek) Departure : 9:30 AM Duration : 3 hours Participation fee : free, but advance registration is required. (This activity is offered by the municipality of Oudsbergen).