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 Sodertalje kanal, Hammarbyslussen, Karl Johanslussen and Norrstrom.The easternmost bay of Malaren, in central Stockholm, is called Riddarfjarden. The lake is located in Svealand and bounded by the provinces of Uppland, Sodermanland, Narke, and Vastmanland.The two largest islands in Malaren are Selaon (91 km²) and Svartsjolandet (79 km²),island Adelso have been a UNESCO World Heritage Site.