Changes in sea level from 16,000 years ago to present in northwest Europe.
This is a dangerous field to study, they may even be accused of heresey against doctrine
I find it amazing that there was a time I could drive to France from England in my Hyundai where the English Channel is now.
Nice map! I think I’ll swipe it right now...
http://www.unexplained-mysteries.com/forum/index.php?showtopic=179840&st=690
http://nextnature.net/wp-content/uploads/2009/04/2007_dogger_re-engineered_satelite_photo_530.jpg
http://friedfoo.files.wordpress.com/2011/01/doggerland2.jpg
http://education.nationalgeographic.com/media/photos/000/318/31836.jpg
The teacher of the class I was in noted that one features of Norse Myth was that it was Grotesque; Thor could walk over the Baltic, he would walk in a Giant's Glove, then arm wrestle with the same giant. Sizes and distances were not consistent.
Based on what I see here, regarding a trip from Sweden to Finland, it may suggest a very ancient source for the story as This trip was possible at one time.
Suggesting is one thing. I don't think its possible to show that a pre-flood Northern Europe is reflected in Norse literature or oral tradition surviving 11 or 10 millennia in a pre-literary oral recollection.