The walk takes you to the Bosbeek Valley. The Bosbeek springs at the border of As and Genk. It forms the boundary between As and Opglabbeek, a part of Oudsbergen, over a distance of 2.5 km. The Bosbeek then flows through Opoeteren and Neeroeteren to eventually merge into the Maas in Aldeneik (near Maaseik). The Bosbeek has a significant drop which made it particularly suitable for water mills. The Theunissen mill is one of the 12 mills on the Bosbeek. You will also pass by the Rouwmortelven. This beautiful heath pond is a chosen spot for plants of the 'wet heath': cotton grass, heather, and the carnivorous sundew. It is a habitat for dragonflies and amphibians, including a number of very rare species (heath frog, great crested newt, bog hoverfly).
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