Vesan

{{Infobox body of water

| name = Vesan

| image = Vesan with Gammalstorp church.JPG

| caption = The church of Gammalstorp seen on the former island in the former lake

| alt = Photograph

| image_size = 250

| pushpin_map = Sweden Blekinge # Sweden

| pushpin_map_alt = Location of Vesan

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| location = Sölvesborg

| coords = {{coord|56.104981|14.6406555|scale:100000|display=inline,title|format=dms}}

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| outflow = 8 miljon cubic meters/year{{cite report|section=Natur|trans-chapter=Nature|title=Planprogram för Sölve verksamhetsområde|trans-title=Planning program for the Sölve business area|type=|url=http://www.solvesborg.se/9100|language=sv|publisher=Sölvesborg Municipality|date=8 October 2008|accessdate=12 July 2011|archive-url=https://web.archive.org/web/20110927034752/http://www.solvesborg.se/9100|archive-date=27 September 2011|url-status=dead|df=dmy-all}}

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| basin_countries = Sweden

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}}

Vesan is a former lake in Sölvesborg, Blekinge County, Sweden. Originally Vesan was a strait. In the area between Ryssberget and Listerlandet, water from Hanöbukten flowed in and in effect cut off Listerlandet from the rest of the mainland. The sound was open to sail through until the 18th century, but increased growth of reeds made the opening too narrow.Geological Institution at the University of Lund{{full citation needed|date=August 2022}}

The area around Vesan contains the earliest evidence of human habitation in Blekinge, a small settlement dating to 9700 BC.{{cite book|last=Persson|first=Carl|chapter=Jägare/samlare i Sölvesborgstrakten 9 700–2 300 f. Kr.|trans-chapter=Hunterers/gatherers in the Sölvesborg area in 9 700–2 300 BC|title=Arkeologi i Blekinge|year=2022 |trans-title=Archaeology in Blekinge|editor-last1=Henriksson|editor-first1=Mikael|editor-last2=Menander|editor-first2=Hanna|editor3=National Historical Museums|editor-last4=Ström|editor-first4=Susanne|publisher=Blekinge museum|isbn=978-91-983465-3-4|page=8}} Nowadays the former lake is farmland. The church of Gammalstorp lies on the small hill that formerly was an island.