Bornsjön is a lake at Södertörn in Salem Municipality in Södermanland, Sweden. It is part of Norrström's main catchment area. The lake is 17 metres deep, has an area of 6.34 square kilometres (2.45 sq mi), and is 11 metres above sea level. In test fishing, a large number of fish species have been caught, including European perch, white bream, common bream and ruffe.

You can help expand this article with text translated from the corresponding article in Swedish. (October 2011) Click [show] for important translation instructions. View a machine-translated version of the Swedish article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Swedish Wikipedia article at [[:sv:Bornsjön]]; see its history for attribution. You may also add the template {{Translated|sv|Bornsjön}} to the talk page. For more guidance, see Wikipedia:Translation.

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Bornsjön
Bornsjön
Coordinates	59°14.40′N 17°45.39′E
Basin countries	Sweden

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The lake is within the boundaries of the Bornsjön Nature Reserve, and has been sheltered since 1920.

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