Heiliges Meer-Heupen
Heiliges Meer-Heupen
Natural monuments in Heiliges Meer-Heupen are primarily shaped by unique geological processes, located within a significant nature reserve in North Rhine-Westphalia, Germany. This area features several remarkable natural monuments, including sinkhole lakes and extensive heathlands. The reserve is characterized by special habitats and rich biodiversity, supporting a wide array of flora and fauna. Ongoing geological processes, such as the formation of sinkholes, highlight the dynamic nature of the landscape.
Last updated: May 24, 2026
Highlight • Lake
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Popular around Heiliges Meer-Heupen
There's also a great hut at the border triangle.
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Here you will find a rest area and interesting information about how these lakes were formed
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To the east of the Great Holy Sea is the Small Holy Sea, which is privately owned but also protected. To the southwest are the sinkhole lake and the Heideweiher pond. The sinkhole lake was formed on April 14, 1913, during the last major sinkhole in the protected area.
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A break hut with TV broadcast – I’ve never seen anything like that before.
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Beautiful lake. Unfortunately, the lake is fenced off.
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The region is renowned for its unique geological formations. Key natural monuments include the Great Holy Lake, the largest natural standing water body in North Rhine-Westphalia, and the Sinkhole Lake, famously formed by a sudden collapse in 1913. You can also discover the Heath pond at Heiliges Meer, known for its rare flora like bladderwort and sundew.
Heiliges Meer-Heupen is characterized by its fascinating geological processes. The most prominent features are the 'sinkhole lakes' (Erdfallseen), which formed from the collapse of underground cavities due to dissolving saline rock layers. The entire region lies within a tectonic fault zone, meaning these dynamic processes, including ongoing sinkhole formation, continue to shape the landscape.
Yes, several natural monuments and trails are suitable for families. The Sinkhole Lake and the Heath pond at Heiliges Meer are both considered family-friendly. The well-signposted circular routes through the area are generally easy to navigate, and the LWL-Museum für Naturkunde offers educational programs and excursions that are great for all ages.
The area offers a variety of outdoor activities. You can enjoy hiking around the lakes and through the heathlands. For more structured activities, there are numerous running trails, such as the 'Heiliges Meer Nature Reserve loop' or the 'Sinkhole Lake – Great Holy Lake loop'. Cyclists can explore road cycling routes like the 'Bodelschwingh Canal – Herthasee loop' or MTB trails such as the 'Glück Auf Monument – Historic Mining Tunnel loop'. Find more details on these activities in the running trails, road cycling routes, and MTB trails guides for Heiliges Meer-Heupen.
The Heiliges Meer-Heupen nature reserve is beautiful year-round, but it's particularly vibrant in spring and autumn. During these seasons, the heathlands burst with purple heather and blooming dwarf shrubs. The LWL-Museum für Naturkunde's education and research center is open from late March to late October, offering free exhibitions and making these months ideal for a visit.
Yes, visitors can find facilities such as the Rest shelter at Heiliges Meer, which offers a place to relax and sometimes provides informational leaflets. There's also the Tripoint at Heiliges Meer Nature Reserve, which serves as a viewpoint and marks the border of three towns. The LWL-Museum für Naturkunde also provides an excellent starting point with exhibitions and information.
The reserve's diverse habitats support a rich array of flora and fauna. You might spot various meadow birds such as the Eurasian curlew, lapwing, and yellow wagtail, especially in the Heupen wet meadow area. The heathlands are home to unique plant species, and the interplay of different water bodies supports a wide range of biodiversity.
The LWL-Museum für Naturkunde operates an education and research center near the Great Holy Lake. It offers free exhibitions on the lake's formation and ecological importance. The center is open from late March to late October. For specific opening hours and program details, it's advisable to check their official website or contact them directly.
While the nature reserve encourages visitors to enjoy its beauty, specific rules regarding dogs, such as leash requirements and waste disposal, are typically in place to protect the sensitive ecosystem and wildlife. It's generally recommended to keep dogs on a leash and clean up after them. Look for local signage for precise regulations.
Visitors frequently appreciate the serene landscapes and the unique geological history of the area. Many highlight the peaceful hiking opportunities around the reed-lined shores of the Great Holy Lake and the atmospheric beauty, especially during evening hours. The distinct formation story of the Sinkhole Lake also captivates many, offering a glimpse into dynamic natural processes.
Yes, the area features well-signposted circular routes that allow you to experience various natural monuments. These paths often lead through the heath areas, past different ponds, and around the major sinkhole lakes, providing a comprehensive view of the reserve's diverse landscapes and unique features.
While specific public transport routes can vary, the Heiliges Meer-Heupen nature reserve is generally accessible. It's recommended to check local bus schedules or regional transport options that connect to nearby towns like Hopsten or Recke, from which you might find closer stops or walking routes to the reserve's main entrances. Parking information is also available for those traveling by car.


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