Best lakes around Flachsee is an artificial lake located on the Reuss river, south of Bremgarten in the Aargau region of Switzerland. Created in 1975, it functions as a significant nature reserve and bird sanctuary. The lake spans 72 hectares and features extensive marshlands and small islands, providing habitat for numerous bird species. While swimming is not permitted, the area offers opportunities for walking and enjoying the natural surroundings.
Last updated: April 30, 2026
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Yesterday, through a highly magnified pair of binoculars on one of these islands, I was able to observe five cormorants in close harmony: Magnificent! The birdlife here is truly diverse - a magnifying glass is actually a must. But the photos stored here by Komoot users are also great in this highlight - especially the photo of the kingfisher, which I unfortunately haven't had the chance to see yet...
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Very nice! Especially during sunset.
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Floodplain landscape and lots of nature
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The Flachsee is a natural paradise
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Simply pure nature, what more can you say!
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Man-made and still nature poor😉
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It's always beautiful but it's especially beautiful around Christmas time with the decorations!
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Beautiful bird viewing point. There are really nice photos early in the morning, as well as in the evening. But you can also see the birds really well during the day.
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The Flachsee is a vital nature reserve and bird sanctuary, home to around 50 breeding bird species and over 240 registered species, including cormorants, kingfishers, and grey herons. Beavers have also re-established themselves here. The area features extensive marshlands and small islands, providing a rich habitat for wildlife.
No, swimming is not permitted in the Flachsee. It is designated as a nature reserve, and its primary purpose is to protect the diverse wildlife and natural environment.
Yes, the Flachsee is renowned for birdwatching. There are dedicated observation stands, such as the Birdwatching Hide at Flachsee Waterbird Reserve, where you can observe rare waterfowl and many other bird species throughout the year. Another great spot is the Birdwatching spot, which offers an elevated view of the lake.
Beyond the rich birdlife, you might encounter beavers, which have re-established themselves in the area. The Flachsee and the Water Buffalo area is also known for its grazing water buffalo, adding to the unique natural experience.
Absolutely. The entire Flachsee area is considered family-friendly, offering opportunities for walking and enjoying nature. Highlights like the Flachsee Nature Reserve and the Birdwatching Hide at Flachsee Waterbird Reserve are great for families to explore and observe wildlife together.
The Flachsee is excellent for bird observation at any time of the year. In winter, the lake can offer a mystic atmosphere due to fog, especially during sunrise, making it a photographic spot. Spring and autumn are particularly good for observing migratory birds.
The Flachsee area is popular for various outdoor activities. You can enjoy easy hikes around the lake, with routes like the 'Flachsee Nature Reserve – Hermetschwil Abbey loop'. Cycling and gravel biking are also popular, with guides such as Cycling around Flachsee and Gravel biking around Flachsee available.
Yes, there are several easy hiking trails around Flachsee, perfect for a leisurely stroll. For example, the 'Great view of the Flachsee – Flachsee loop' is an easy 4.2 km route. You can find more options in the Easy hikes around Flachsee guide.
The Flachsee offers a beautiful floodplain landscape with scenic views that can stretch from the Alps to the Jura mountains on clear days. The area is characterized by marshlands, small islands, and the meandering Reuss river, providing a tranquil natural setting.
Yes, there are good access points and parking available, particularly near the Rottenschwil bridge. While the guide doesn't detail specific public transport routes, the area is generally accessible for visitors.
The Flachsee is an artificial lake created in 1975. It was formed by the construction of a dam at Bremgarten-Zufikon on the Reuss river, transforming a section of the river into a reservoir with extensive marshlands.
Beyond its status as a nature reserve, a small ferry operates in the summer, transporting walkers and nature enthusiasts across the former river. The presence of water buffalo grazing in areas like Flachsee and the Water Buffalo also offers a unique natural experience.


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