|Catchment area||128 km2 (49 sq mi)|
|Max. length||8.4 km (5.2 mi)|
|Max. width||1.5 km (0.93 mi)|
|Surface area||10.3 km2 (4.0 sq mi)|
|Average depth||28 m (92 ft)|
|Max. depth||48 m (157 ft)|
|Water volume||0.285 km3 (231,000 acre·ft)|
|Residence time||3.9 years|
|Surface elevation||449 m (1,473 ft)|
|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. The main river leading to this lake is the Aabach, which is coming from the Lake Baldegg.
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
- Lake Hallwil in German, French and Italian in the online Historical Dictionary of Switzerland.
- Waterlevels of Lake Hallwil at Meisterschwanden
- Profile of Lake Hallwil at schweizersee.ch
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