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About this place
Lachner Aahorn Turm is a bird observation tower in Lachen, canton Schwyz, set inside the Lachner Aahorn nature reserve on the shore of Upper Lake Zurich (Obersee). The tower looks over parts of the reserve that visitors cannot enter, so it is the easiest way to watch the wildlife without disturbing it.
What is Lachner Aahorn?
The reserve is a renaturalised floodplain where the river Aa meets the lake. It sits on the Obersee, which is listed in the Swiss federal inventory of landscapes and natural monuments of national importance (BLN 1406). The listing protects the lake's largely natural shoreline and reed meadows, and its role as a breeding, resting and feeding site for migratory birds.
What can you see from the tower and the trail?
From the platform you can view sections of the reserve that are closed to entry. An elevated boardwalk crosses the reeds of the Brachsmenbucht bay, with information boards along the way. The area is known for waterfowl and reed birds. In winter, look for several duck species, including red-crested pochard and common goldeneye.
How do you get there?
Park near the small marina on the south side of the reserve, or at the primary school or the water treatment plant, then continue on foot. Komoot lists an easy loop from Lachen marina through the reserve of about 5.3 km, taking roughly 1 hour 20 minutes.
When should you visit, and what are the rules?
During the breeding season the passage is closed completely to protect the birds. Outside that period a path leads to a gravel bank on the lake. The nearby power plant can release large amounts of water into the Aa, which floods the gravel bank quickly, so entering the riverbed is forbidden. Winter and migration periods are good for waterbirds. Check current access restrictions before you go.
Frequently asked questions
Where is the Aahorn tower?
In Lachen, on Upper Lake Zurich in canton Schwyz, Switzerland.
Can you walk through the whole reserve?
No. Parts are off limits, and the passage is fully closed in the breeding season. You view the closed areas from the tower.
What birds can you see in winter?
Waterfowl such as red-crested pochard and common goldeneye.
How long is the walk from Lachen marina?
The easy loop through the reserve is about 5.3 km and takes roughly 1 hour 20 minutes.
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