Lake Sempach, German: Sempachersee, is a lake in the canton of Lucerne, Switzerland. Its area is about 14.5 km2 and its maximum depth is 87 m. A 50-metre-large island named Gamma Insel is located east of Sursee. Many inhabitants of local areas swim, boat, paddle, and fish in Lake Sempach, due to its ease of accessibility. Coming from the southern municipality of Neuenkirch, the Grosse Aa flows into the lake at the place called Seesatz. The lake ends in the north starting the Suhre River, a tributary of the Aare river.

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