Lake Thun, known as “Thunersee” in German, is a picturesque Alpine lake situated in the Bernese Oberland region of Switzerland, near Interlaken. With a length of approximately 17 kilometers (10.5 miles) and a width of 3.5 kilometers (2.2 miles), Lake Thun is surrounded by majestic mountains, charming villages, and historic castles.

Visitors to Lake Thun can embark on scenic boat cruises that offer stunning views of the surrounding landscapes and the chance to visit towns such as Thun and Spiez along the lake’s shore. The lake’s crystal-clear waters also make it an ideal spot for swimming, kayaking, and stand-up paddleboarding during the warmer months.

One of the highlights of Lake Thun is the Schloss Thun, a medieval castle located on the hill overlooking the town of Thun. The castle houses a museum showcasing the region’s history and offers visitors the opportunity to explore its towers and courtyards while enjoying panoramic views of the lake and the Bernese Alps.

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