|Catchment area||128 km²|
|Max. length||8.4 km|
|Max. width||1.5 km|
|Surface area||10.3 km²|
|Average depth||28 m|
|Max. depth||48 m|
|Water volume||0.285 km³|
|Residence time||3.9 years|
|Surface elevation||449 m|
|Settlements||Beinwil am See, Meisterschwanden, Seengen|
Lake Hallwil (German: Hallwilersee) is a lake largely in the Canton of Aargau, Switzerland, located at . 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.
Its surface is approximately 10.3 km² and its maximum depth is 48 metres. It is a popular vacation destination.
Media related to Lake Hallwil at Wikimedia Commons
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