Doggerland, a low-lying landmass in the North Sea, could have been Atlantis just as easily as anything else might have been, and it may have been abandoned after being hit by a 15 foot high tsunami generated by a subsea landslide off the coast of Norway 8,200 years ago. 

During the last Ice Age, sea levels were much lower; at its maximum extent Doggerland connected Britain to mainland Europe. It was possible for human hunters to walk from what is now northern Germany across to East Anglia. But from 20,000 years ago, sea levels began to rise, gradually flooding the vast landscape.

Credit and link: BBC

Presented at the European Geosciences Union General Assembly in Vienna.

Prehistoric North Sea 'Atlantis' hit by 5m tsunami By Paul Rincon, BBC