Best natural monuments around Lengwil are characterized by the region's diverse natural setting in the canton of Thurgau, Switzerland. Situated in the Seerücken hills, Lengwil offers expansive agricultural landscapes, significant forest areas, and panoramic views of Lake Constance. The area's natural charm stems from its cultivated fields, dense forests, and the broader vistas of the lake and, on clear days, the distant Swiss Alps. These features collectively define the natural attractions for visitors seeking outdoor experiences.
Last updated: June 26, 2026
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A few years ago, the gardeners of Mainau created a flowerbed in the shape of Lake Constance on the slope along the waterfront garden, which brings the geography of the Swabian Sea closer to us in a floral way.
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Information about the arboretum can be found here: https://www.mainau.de/de/ariatlementen-detail/ attraction/arboretum.html?location=arboretum
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At the end of October, the signs for the Lake Constance locations were still up and the outline of Lake Constance was recognizable. Unfortunately, nothing has bloomed anymore, but the idea for the summer is great.
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Impressively beautiful and powerful.
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I can't resist and just have to quote the incomparable humorist Heinz Erhardt (1909 - 1979), who was known to a wide audience for his wit and "another poem", with a short quatrain: "Trees, trees, nothing but trees, and in between - spaces. But behind it all, you can hardly believe it: Another tree!" (H.Erhardt)
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A short jetty leads out to a hut in the water with a good little viewing platform. water lilies and bird life.
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The trees are fascinating
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Around Lengwil, you'll find a diverse natural setting characterized by expansive agricultural landscapes, significant forest areas, and panoramic views of Lake Constance and the distant Swiss Alps. While traditional geological formations are less common, the area's natural charm comes from its cultivated fields, dense forests, and unique botanical collections. For instance, Mainau Island offers a rich display of flora and impressive arboreal collections.
Yes, the Bommer Weiher Water Lilies highlight a quiet nature reserve. It's an ideal spot for stress relief, offering opportunities for birdwatching and enjoying the serene environment, complete with water lilies and a small viewing platform.
The area boasts several unique botanical attractions. The Giant Sequoia (Sequoiadendron giganteum) at Mainau Arboretum features impressively large and powerful sequoias, among the oldest of their kind in Europe. Additionally, the Lake Constance Floral Relief on Mainau Island is a unique natural monument where flowers are arranged to depict Lake Constance and its neighboring cities, with the display changing seasonally.
Absolutely. Lengwil's location in the Seerücken hills provides magnificent views of Lake Constance. On clear days, you can also see the distant Swiss Alps. Mainau Island, for example, offers panoramic vistas of the Bodensee landscape and the Alps from its Mediterranean Terraces.
Many natural attractions around Lengwil are family-friendly. Mainau Island is particularly popular, featuring a butterfly house, various gardens, and the arboretum. The Bommer Weiher Water Lilies nature reserve also offers a peaceful outing for families to observe nature and wildlife.
The region around Lengwil offers various outdoor activities. You can explore cycling routes like the 'Weinfelden Old Town loop' or the 'Lake Promenade in Uttwil – Lake Constance Cycle Route loop'. For running, consider trails such as the 'Kreuzlingen Harbor – Seeburg Observation Tower loop'. Gravel biking options include the 'View of Emmerzer Weiher – Bommer Weiher Water Lilies loop'. You can find more details on these activities in the cycling guide, running guide, and gravel biking guide for Lengwil.
While specific hiking trails directly through the listed natural monuments are limited, the broader Lengwil area, situated in the Seerücken hills, offers nature-oriented circular hikes. These routes often reveal 'unknown ravines' and provide views of Lake Constance and the Swiss Alpine peaks, allowing you to appreciate the natural beauty of the region.
Visitors particularly appreciate the serene and picturesque natural settings. The quiet nature reserves like Bommer Weiher Water Lilies are praised for their stress-relieving atmosphere and opportunities for birdwatching. The botanical displays and impressive trees on Mainau Island, including the giant sequoias and seasonal floral arrangements, are also highly valued for their beauty and uniqueness.
The Italian Floral Water Staircase is a man-made monument with natural elements located on Mainau Island. It connects Mediterranean terraces with a watercourse made from Calanca gneiss, inspired by Italian Renaissance gardens. It features columnar cypresses and varied seasonal plantings, creating a southern flair.
While specific details for each natural monument are not provided, Lengwil is a municipality in Thurgau, Switzerland, and Swiss public transport is generally well-developed. It's advisable to check local bus and train schedules for connections to areas near the natural attractions you wish to visit, such as those around Lake Constance or the Seerücken hills.
Yes, Mainau Island itself is considered a natural monument but also has significant historical and cultural aspects. It features a castle and gardens designed by Grand Duke Friedrich I, and the island has been owned by the Bernadotte family since 1974, adding a rich historical layer to its natural beauty.
The best time to visit largely depends on what you wish to see. For vibrant floral displays, spring (late March to mid-May for tulips, daffodils, hyacinths) and summer (June for rhododendrons and roses, July-August for angel trumpets and passion flowers) are ideal, especially on Mainau Island. Autumn (September to October) offers magnificent tree coloring and dahlia fields. The views of Lake Constance and the Alps are beautiful year-round, though clearer on crisp days.


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