Ältasjön (Swedish: "Lake of Älta") is a lake in southern Stockholm, Sweden, located north-east of Lake Flaten and named for the vicinity to the urban district Älta.Ältasjön, of which the easternmost fourth belongs to the Stockholm Municipality and the rest to Nacka Municipality, is the uppermost lake in the Sicklaån water system which also include Ulvsjön, Söderbysjön, Dammtorpssjön, Källtorpssjön, Järlasjön, and Sicklasjön.
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