Natural monuments around Diepoldsau feature the Alter Rhein and Naturschutzgebiet Fahrmad, offering diverse natural beauty and ecological habitats. The Alter Rhein, a former section of the Rhine riverbed, is a biodiversity hotspot with tranquil waters and floodplain forests. The Naturschutzgebiet Fahrmad is a significant amphibian spawning ground, home to species like the Great Crested Newt. These areas provide recreational opportunities and showcase the region's natural heritage.
Last updated: June 26, 2026
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Fantastic 360° view from the Hohe Kugel of the mountains as well as the Rhine Valley and Lake Constance.
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It's a really great trip here.
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Always a nice tour, whether on foot or by bike. The wide and all-round view is really awesome. A sunrise on the globe is beautiful, it's worth getting up early.
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Spectacular nature in the gorge and easily doable for many thanks to the easy route.
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Is always worth a trip
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Insanely beautiful there. It is definitely worth it.
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Insanely beautiful there. It is definitely worth it.
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The region around Diepoldsau is characterized by the Alter Rhein, a former section of the Rhine riverbed now a biodiversity hotspot, and the Naturschutzgebiet Fahrmad, a vital amphibian spawning ground. You can also find impressive gorges like Alploch Gorge and Rappenloch Gorge, as well as summits offering panoramic views such as Hohe Kugel summit (1,645 m).
The Alter Rhein is a rich habitat for European water birds like kingfishers and great crested grebes, as well as beavers, snakes, and various fish species. The Naturschutzgebiet Fahrmad is particularly important for amphibians, including the highly endangered Great Crested Newt, and supports various insects and reptiles like the grass snake.
Yes, several natural monuments are suitable for families. The Rappenloch Gorge offers an interesting and cool environment on warm days. The Karren Viewing Platform provides great views and is accessible. Additionally, the Staufensee Waterfall and Dam is a picturesque spot for a family outing. The Alter Rhein also features natural beaches ideal for a day out with children.
The areas around Diepoldsau's natural monuments are excellent for various outdoor activities. You can enjoy hiking, cycling, and mountain biking on well-maintained paths. The Alter Rhein is also popular for swimming and stand-up paddling. For more detailed route information, you can explore the Hiking around Diepoldsau guide, the Cycling around Diepoldsau guide, or the MTB Trails around Diepoldsau guide.
Absolutely. You'll find numerous hiking trails, including easy and moderate options. For instance, the 'Old Rhine – View of the Rhine River loop from Diepoldsau' is an easy 7.6 km hike, and the 'Old Rhine – Dam border crossing loop from Diepoldsau' is a moderate 12.9 km trail. These routes allow you to explore the natural beauty of the Alter Rhein. Discover more options in the Hiking around Diepoldsau guide.
The natural monuments around Diepoldsau can be enjoyed almost any season. Spring and autumn offer pleasant temperatures for hiking and cycling, with vibrant flora and fauna. Summer is ideal for swimming and stand-up paddling in the Alter Rhein. Even in winter, a family-friendly circular hike along the Alter Rhein can be a rewarding experience.
The Alter Rhein is a result of the 20th-century Rhine straightening project, specifically the Diepoldsau cut-off in 1923, which was a major engineering effort to prevent flooding. This historical river arm also holds importance from World War II, as a pipe at the border between Lustenau and Diepoldsau served as an escape route to Switzerland.
The Naturschutzgebiet Fahrmad is a crucial nature reserve primarily designated as one of the most significant amphibian spawning grounds in the region. It provides a protected habitat for various amphibian species, including the federally protected Great Crested Newt, and supports a diverse ecosystem for insects and reptiles.
Yes, there are several circular routes. A family-friendly circular hike along the Alter Rhein and the new Rhine is suitable for almost any season. For cyclists, the 'Old Rhine at Diepoldsau – Alter Rhein Recreation Area loop' is an easy 20.8 km option. Hikers can enjoy the 'Old Rhine Nature Reserve – Alter Rhein Nature Park loop' which is a moderate 11.1 km trail. You can find more circular routes in the respective activity guides.
Visitors particularly appreciate the scenic beauty and accessibility of gorges like Alploch Gorge, noting its well-maintained paths. The Rappenloch Gorge is loved for its cool environment on warm days and interesting rock formations, often merging seamlessly into the Alploch, offering a continuous natural experience.
While the natural monuments themselves are focused on nature, the Karren Viewing Platform features a restaurant with stunning views. Diepoldsau and nearby towns offer various cafes and restaurants where you can refuel after exploring the natural areas.
From the Hohe Kugel summit (1,645 m), you can enjoy a fantastic 360° panoramic view extending over the entire Rhine Valley and into neighboring countries like Austria, Switzerland, Germany, and Liechtenstein. The Karren Viewing Platform also offers expansive views of the Rhine Valley and Lake Constance.


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