The hike starts in the town of Haelen, which is bisected by the Haelense Beek. The Haelense Beek or Haelensche Beek has a length of 11 kilometers and is of great cultural-historical importance because of the castles that lie along it, such as Aldenghoor castle. Also near the castle is the stone building of the Vogelmolen, a former watermill. After following the stream to the town of Numhem, the hike continues to the Leudal nature reserve, parts of the area are beautiful examples of the stream valley landscape. The Leubeek (upstream the Tungelroyse Beek), the Zelsterbeek and the Roggelse Beek flow through the area. In the area, the Leubeek and the Roggelse Beek are followed. Attractions include the Leu mill, also known as the Sint Ursula mill, and the remainder of the Elisabeth mill. What is special about the Sint Ursula mill is that this water mill is the only one of the six still existing water-oil mills in the Netherlands, which houses a corn mill and an oil mill under one roof. At the end of the walk you will pass Aldenghoor Castle. The first mention of Aldenghoor Castle dates from 1212 when there is mention of a fortified house Ghoor of the lords of Ghoor de Horne. When these lords had a new castle built in nearby Neer, it was called Neyenghoor and in response to this, the castle in Haelen was renamed Aldenghoor (new Ghoor and old Ghoor respectively).