The Peelrand fault near Uden is one of the most recognizable fault zones in Brabant and cuts across the landscape between the Bedafse Bergen and the Annabos. This geological fault causes a height difference of several meters, but more importantly, a difference in water management that is immediately visible in the terrain. On the higher side of the fault, mineral-rich groundwater rises, making this higher part wetter than the lower-lying zone adjacent to it. This inverse pattern of wet and dry is both indicative and unique to this area.
Along the fault line, you can see how the dry drifting sand of the Bedafse Zandduinen abruptly transitions into dark, moist soil where seepage water surfaces. The water often has a reddish-brown hue due to the iron carried from the deeper layers. This transition is clearly visible in the field: a few meters further, the landscape changes completely, from dry and light sand to wet, boggy terrain with alders, sedges, and other moisture-loving plants. The Peelrand fault near Uden is therefore a significant geological feature that shapes the entire area. Without it, the Bedafse Bergen wouldn't be so dry and drifting, and the Annabos wouldn't be so wet and seepage-prone. The fault makes this part of Uden one of the best places to see the "wisp" phenomenon in person, and it gives the hiking trail a scenic quality found in few other places.