Lake Sempach

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Lake Sempach
Picswiss LU-20-42.jpg
Location Canton of Lucerne
Coordinates 47°8.6667′N 8°9.1′E / 47.1444450°N 8.1517°E / 47.1444450; 8.1517Coordinates: 47°8.6667′N 8°9.1′E / 47.1444450°N 8.1517°E / 47.1444450; 8.1517
Primary inflows Gross Aa, Chli Aa (Sempachersee), Meierhofbach, Wilibach, Dorfbach (Sempachersee), Brandbach, Röllbach (Sempachersee), Lipperütibach, and some unnamed
Primary outflows Suhre
Basin countries Switzerland
Surface area 14.5 km2 (5.6 sq mi)
Average depth 44 m (144 ft)
Max. depth 87 m (285 ft)
Water volume 0.66 km3 (540,000 acre⋅ft)
Residence time 16.9 years
Surface elevation 503.77 m (1,652.8 ft)
Islands Gamma Insel
Settlements Sursee, Sempach

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.

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