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| Hjälmaren | |
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  Hjälmaren | |
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| Coordinates | 59°15′N15°45′E / 59.250°N 15.750°E /59.250; 15.750 |
| Primary outflows | Eskilstunaån |
| Basin countries | Sweden |
| Max. length | 58 km (36 mi)[1] |
| Max. width | 18 km (11 mi)[1] |
| Surface area | 483 km2 (186 sq mi)[1] |
| Average depth | 6.2 m (20 ft)[1] |
| Max. depth | 20 m (66 ft)[1] |
| Water volume | 3 km3 (2,400,000 acre⋅ft)[1] |
| Settlements | Örebro |
| References | [1] |
Hjälmaren (Swedish pronunciation:[ˈjɛ̂lːmarɛn]or[ˈjɛ̂lːmaɳ][2]), also spelledJälmaren,[2] isSweden's fourth largest lake. It is situated in theCentral Swedish lowland and drains throughEskilstunaån into the adjacent LakeMälaren, which in turn drains into theBaltic Sea, west ofStockholm. It is connected by waterway with Stockholm by the 13 kilometres longHjälmare kanal.
It is bounded by theprovinces ofSödermanland,Närke, andVästmanland.
Hjälmaren is 63 kilometres long, about 20 kilometres wide, and has an average depth of 6 metres, and a surface of 483 km2. The largest towns around the lake isÖrebro andEskilstuna situated at the western and eastern ends of the lake.
Between 1878 and 1887, a damming project lowered the surface level of Hjälmaren 1.3 metres (4.3 ft) to free up land for agriculture and to reduce the risk of flooding.
RebelEngelbrekt Engelbrektsson was assassinated in 1436 atEngelbrektsholmen, an islet in Lake Hjälmaren.
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