Best natural monuments around Mühlhausen-Ehingen are found in the Hegau region, characterized by its volcanic origins and diverse natural landscape. The area features unique geological formations, including volcanic cones and kettle holes, alongside protected individual trees. Mühlhausen-Ehingen offers a variety of natural features for exploration, from ancient trees to significant geological sites.
Last updated: May 11, 2026
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The Höwenegg crater is not one of the dolines typical of the Swabian Alb, but a real volcanic crater. Geologically, it belongs to the Hegau volcanic region. Basalt mining has also shaped the crater's current appearance. You have a wonderful overview from this point.
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The Aachquelle is the largest spring in Germany.
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The present ruins of the summit castle are located on the summit of the 644 m high Hohenkrähen ("Krayen"), a mountain of volcanic origin north of Singen in the Hegau, between the villages of Duchtlingen, Schlatt unter Krähen and Mühlhausen in the Duchtlingen district.
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Steep but well-secured stone path to the castle ruins.
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A very good viewpoint overlooking the crater lake, with a small rest area and information panel. Even though there is a large fence around the crater rim for safety reasons, a good view is still possible.
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Beautiful viewpoint from the hiking trail around the crater lake of the deep blue lake and the volcanic caldera.
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Shady spot with a small kiosk. Ideal for taking a break. 😉
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a nice rustic seating area
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The region around Mühlhausen-Ehingen, part of the Hegau volcanic landscape, offers a diverse range of natural monuments. You can find unique geological formations like the Höwenegg Crater Lake, which is a former basalt mining area known as the "Blue Eye" of the Hegau. There are also officially protected sites such as the extensive area natural monuments like Kiesgrube Betteläcker and Toteisloch Rupfdenvogel, which are significant for their geological and ecological value. Additionally, you'll encounter individual natural monuments like ancient lime and pedunculate oak trees, protected for their age and size.
Yes, several natural monuments in the region are intertwined with historical sites. For instance, the hike to Hohenhewen Castle, situated on a volcanic cone, offers not only breathtaking panoramic views but also a glimpse into the region's past through its castle ruins. Similarly, Hohenkrähen Castle Ruins are located on a steeply sloping volcanic cone, providing a distinctive perspective of the landscape and its history.
For stunning panoramic views, the observation platform at Hohenhewen Castle is highly recommended. From here, you can see the Hegau mountains, Lake Constance, and the Swabian Alb, and even the Alps and Black Forest on clear days. The Hohenkrähen Castle Ruins also offer fantastic views of the Hegau and Lake Constance area from its volcanic cone.
While specific family-friendly designations for all natural monuments aren't detailed, the Aachtopf (Aach Spring) is noted as family-friendly. It's Germany's most productive spring, offering an impressive natural spectacle. Many of the hiking trails that lead to natural monuments, such as the 'Heimatpfad 'rundum'' or the 'Rundweg Ursula-Brunnen', are suitable for families looking to explore nature together, though some ascents to castle ruins can be challenging.
The area around Mühlhausen-Ehingen is excellent for various outdoor activities. You can find numerous routes for gravel biking, running, and cycling. For example, there are several gravel biking routes like the "Aach Riverside Cycle Path" and cycling routes such as "View of Hohentwiel – Aach Riverside Cycle Path loop." Runners can enjoy trails like the "Running loop from Hohenkrähen." You can explore more options on the Gravel biking around Mühlhausen-Ehingen, Running Trails around Mühlhausen-Ehingen, and Cycling around Mühlhausen-Ehingen guide pages.
The Hegau region, with its natural monuments, is beautiful throughout the year. Spring and autumn offer pleasant temperatures for hiking and exploring, with vibrant flora or colorful foliage. Summer is ideal for longer days outdoors, though some areas might be more crowded. Even in winter, certain trails and viewpoints can offer unique, serene experiences, especially on clear days when the panoramic views are crisp.
Beyond the prominent volcanic cones, the region features other significant geological formations. The Höwenegg Crater Lake is a prime example, formed in a former basalt mining area and providing insights into the region's volcanic history and ancient ecosystems. Additionally, the Toteisloch Rupfdenvogel is an extensive area natural monument, a kettle hole formed by melting blocks of glacial ice, offering a glimpse into the region's glacial past and supporting diverse flora and fauna.
Visitors particularly appreciate the stunning panoramic views from elevated natural monuments like Hohenhewen Castle and Hohenkrähen Castle Ruins. The unique geological features, such as the "Blue Eye" of the Hegau at Höwenegg Crater Lake, also draw significant interest. The combination of natural beauty, historical context, and diverse hiking opportunities makes the region highly appealing.
Yes, Mühlhausen-Ehingen has five officially protected natural monuments. These include two extensive area natural monuments (flächenhafte Naturdenkmale): Kiesgrube Betteläcker and Toteisloch Rupfdenvogel. There are also three individual natural monuments (Einzelgebilde-Naturdenkmale): a group of three Summer Lime trees and a single Pedunculate Oak, all protected for their ecological, geological, or aesthetic significance. More details can be found on the Wikipedia page for Natural Monuments in Mühlhausen-Ehingen.
While the volcanic cones and crater lake are well-known, the region also holds quieter natural gems. The Kiesgrube Betteläcker, an extensive gravel pit, offers insights into geological processes and unique plant communities. The Toteisloch Rupfdenvogel, a kettle hole, is a significant wetland habitat. Additionally, exploring local hiking trails like the 'Rundweg Ursula-Brunnen' can lead you through picturesque landscapes to tranquil spots like the Ursula-Brunnen, offering different perspectives of the Hegau's natural beauty.
The difficulty of trails varies. Some paths, especially those leading to castle ruins on volcanic cones like Hohenkrähen Castle Ruins, can be quite challenging with steep ascents and rocky passages, sometimes requiring holding aids. Other trails, such as those around the Höwenegg Crater Lake or the Aachtopf, are generally intermediate or easy, making them accessible for a wider range of visitors. Always check specific route details for difficulty ratings.


Extend your search for the best caves by checking out these guides of the top ones around Mühlhausen-Ehingen: