Under the fertile clay lies a permeable limestone layer. The Romans used this lime (which is known as marl in the local dialect) in their constructions. The Heerse limestones were also very useful in the construction of several Haspengouw churches, including the basilica of Tongeren. Between 1930 and 1960, millions of mushrooms were cultivated in these former marl quarries. Now, these caves (also referred to as marl pits) are one of the main hibernation sites for bats in Western Europe.
See something wrong on this route?Add an issue
Navigate route in...
RouteYou app Open
Don't want to see this ad anymore?
→ Upgrade now
Please wait, the navigation is being prepared.
You can now navigate. Have fun on the road!
Processing your request has failed. Please try again.
Don't want to see this ad anymore?
→ Upgrade now
Please wait, your download is being prepared.
Your download is ready. Have fun on the road!
Processing your request has failed. Please try again.
Don't want to see this ad anymore?
→ Upgrade now
Please wait, your print is being prepared.
Your print is ready to download. Have fun on the road!
Processing your request has failed. Please try again.
<iframe src="https://plugin.routeyou.com/routeviewer/free/?language=en&params.route.id=16766293" width="100%" height="600" frameborder="0" allowfullscreen></iframe>
<p><a class="routeYou_embed" href="https://app.routeyou.com/en-be/route/view/16766293?utm_source=embed&utm_medium=article&utm_campaign=routeshare&navigation=external" title="Witch - orange - 5.7 km - RouteYou" target="_blank"><img src="https://image.routeyou.com/embed/route/960x670/16766293-en@2x.png" style="width: 100%; height: auto;" alt="Witch - orange - 5.7 km"></a></p>
Additional feedback:
This feature is only available to RouteYou PREMIUM subscribers.
Try 1 month for free and discover the difference! We don't take any payment details, and your trial ends automatically after one month.
© 2006-2026 RouteYou - www.routeyou.com
Wandelen in Limburg
Start
Download
Download
