Lake Sarnen

Lake Sarnen (Sarnersee) sits beside the town of Sarnen in the Swiss canton of Obwalden. It is the canton's biggest lake, with a surface about 469 m above sea level and an area near 7.5 km². Roughly 6 km long and about 51 m deep at its deepest point, it makes an easy, quiet stop in central Switzerland, not far from Lake Lucerne.

Where is Lake Sarnen?

The lake fills a glacier-carved valley between the Jänzi ridge to the northwest and the Arnigrat to the southeast. Much of the shoreline is flat, so reaching the water is simple. The municipalities of Sarnen, Sachseln and Giswil lie on its banks. The Sarner Aa river feeds the lake, flowing down from Lake Lungern, and carries the water onward toward Lake Lucerne.

How do you get there?

The Brünig railway line follows the eastern shore, so trains from Lucerne or from the Interlaken direction stop in the lakeside towns. Sarnen and Sachseln stations are a short walk from the water. By car, the road along the lake connects the villages, and each has parking near the waterfront.

What is there to see and do?

• Shoreline walks. The level banks suit relaxed strolls and cycling, with views of the surrounding hills.
• Sarnen. The cantonal capital has a monastery and a tidy centre that works well for a short stop.
• Sachseln. Home to the Brother Klaus Museum, devoted to Switzerland's patron saint, and a basilica that draws pilgrims.
• Langis moor. This raised bog above the lake's left bank rewards nature lovers.
• Swimming. In summer the lake is used for bathing and relaxing. It is alpine water, so outside the warm months it stays cool.

When should you visit?

Late spring to early autumn is the most comfortable window: days are long and paths are dry. Early summer suits a swim, while September and October bring autumn colour for walks. Winter is quiet, with snowy peaks as a backdrop.

Frequently asked questions

Can you swim in Lake Sarnen?

Yes, bathers and swimmers use it in summer. Access points are in the lakeside villages; check local notices about designated swimming areas.

How long is a walk around the lake?

The full circuit is fairly long, so many visitors pick one stretch, such as Sarnen to Sachseln, and return by train.

Can I reach the lake by train?

Yes. The Brünig line runs along the eastern shore and stops in towns on the lake.

Is Sarnersee the same as Lake Sarnen?

Yes. Lake Sarnen is the English name; Sarnersee is the German one used locally.