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Lake Hallwil (German: Hallwilersee) is a lake largely in the Canton of Aargau, Switzerland, located at 47°17′N 8°12′E / 47.283°N 8.200°E / 47.283; 8.200. It is the largest lake in Aargau and lies mostly in the districts of Lenzburg and Kulm on the southern edge of the canton. The southern tip of the lake reaches into the canton of Lucerne. The main river leading to this lake is the Aabach, which is coming from the Lake Baldegg.

Lake Hallwil
Hallwilersee
HallwilerSee-2.jpg
LocationAargau
Coordinates47°17′N 8°12′E / 47.283°N 8.200°E / 47.283; 8.200Coordinates: 47°17′N 8°12′E / 47.283°N 8.200°E / 47.283; 8.200
Primary inflowsAabach
Primary outflowsAabach
Catchment area128 km2 (49 sq mi)
Basin countriesSwitzerland
Max. length8.4 km (5.2 mi)
Max. width1.5 km (0.93 mi)
Surface area10.3 km2 (4.0 sq mi)
Average depth28 m (92 ft)
Max. depth48 m (157 ft)
Water volume0.285 km3 (231,000 acre⋅ft)
Residence time3.9 years
Surface elevation449 m (1,473 ft)
SettlementsBeinwil am See, Meisterschwanden, Seengen
Lake Hallwil in the canton of Aargau

Its surface is approximately 10.3 km² and its maximum depth is 48 metres. It is a popular vacation destination.

In 1938 Sir Malcolm Campbell set a world water speed record in Blue Bird K3 on the lake.

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