Diest is a city in Flemish Brabant that is sandwiched between the beautiful nature of the Hageland and the Kempen. This Belgian city is known for its historical connection with the house of Nassau and is therefore considered Oranjestad. Philip Willem, the eldest son of William of Orange, is buried there in the Sint-Sulpitiuskerk. Today, King Willem-Alexander still holds the title Baron van Diest. This walk introduces you to the beautiful nature east of the city. You walk through the Halve Maan Provincial Domain and through the Webbekoms Broek, the flooding area for the river Demer. So make sure you have waterproof shoes! You take a wonderfully varied walk through a landscape that offers a mix of meadows, grasslands, wet forests and reed bushes. This area is home to special bird species, such as the honey buzzard and the bluethroat. You also have a beautiful view of the city walls of Diest and the green hills of the adjacent Belgian Limburg. On the Leopoldsvest you walk over the remnants of the Diester city walls. In 1831, a year after the declaration of Belgian independence, the Dutch King William I tried in vain to recapture Belgium. To prevent new attacks, a defensive belt was constructed around Diest. The current city walls are remnants of this nineteenth-century belt. A little further on you pass the Petrolpoort from 1837. The two rooms at the front of this opening on the rampart served as a storage place for the gunpowder that had to be kept dry at all times. Further on is the Schaffensepoort, the last remaining city gate of Diest. Just outside the city you walk through the humid Demer basin. Here the Zwarte Beek, the Velpe, the Begijnenbeek and the Leugebeek flow into the Demer. These tributaries have been flooding for decades. To counter this, the Flemish government has set up a number of holding basins, areas that can be flooded in a controlled manner to avoid flooding in other places. In the Webbekoms Broek, excess water from the Velpe, the Leugebeek and the Begijnenbeek is collected, so that it can flow in a controlled manner via the Zwarte Beek into the Demer. Here you walk for a while on a bed that was once part of the railway line Tienen - Diest - Mol. This railway was opened in 1878, but closed in the 1960s. The route continues and takes you through the nature reserve back to the starting point.