Valdemarsvik Municipality is a Municipality in Östergötland County, in southeast Sweden. Its seat is in Valdemarsvik with 3,000 inhabitants.Geographically, it is notable for an archipelago and a harbour.Historically Valdemarsvik was mentioned the first time in 1664 as a small town (köping) belonging to the city of Söderköping. It formed an independent municipality with the first day of 1914 See more at Wikipedia.org...