Lake Mälaren (historically occasionally referred to as Lake Malar in English) is the third-largest
lake in
Sweden, after Lakes
Vänern and
Vättern. Its area is 1,140 km² and its greatest depth is 64 m. The lake drains, from Southwest to Northeast, into the
Baltic Sea through Södertälje kanal, Hammarbyslussen,
Slussen and Norrström. The easternmost bay of Mälaren, in central Stockholm, is called
Riddarfjärden. The lake is located in
Svealand and bounded by the
provinces of
Uppland,
Södermanland,
Närke, and
Västmanland. The two largest islands in Mälaren are
Selaön (91 km²) and
Svartsjölandet (79 km²).
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