The Littorina Sea, ca 7 000 years before present (5 000 BC). Shows post-glacial rebound and shore displacement of the Baltic Sea.
<a href="//commons.wikimedia.org/wiki/User:Koyos" title="User:Koyos">Koyos</a>
Own work by uploader + Online map creation; data from "Var gick vattnet", <i>Arkeologisk Information</i> nr 3, Riksantikvarieämbetet &amp; Östergötlands länsmuseum