Vansjø is a lake in the municipalities of Moss, Råde, Rygge, Våler in Østfold county, Norway.

Vansjø is part of Moss watershed (Mossevassdraget) stretching from Østmarka.

Vansjø supplies drinking water in many parts of Moss region.

[2] Etymologically the name likely derives from "Varna sjor", the ancient name of the municipality of Rygge.

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