if atlantis is niflheim then it should be in the north
black sea perhaps?
http://en.wikipedia.org/wiki/Black_Sea_deluge_theory
The
Black Sea deluge is a hypothesized catastrophic rise in the level of the
Black Sea circa 5600 BC due to waters from the
Mediterranean Sea breaching a sill in the
Bosporus Strait
According to a study by Giosan et al. the level in the Black Sea before the marine reconnection was 30 m below present sea level, rather than the 80 m, or lower, of the catastrophe theories. If the flood occurred at all, the sea level increase and the flooded area during the reconnection were significantly smaller than previously proposed. It also occurred earlier than initially surmised, ca. 7400 BC, rather than the originally proposed 5600 BC
In a series of expeditions, a team of marine archaeologists led by
Robert Ballard identified what appeared to be ancient shorelines, freshwater snail shells, drowned river valleys, tool-worked timbers, and man-made structures in roughly 100 metres (330 ft) of water off the Black Sea coast of modern Turkey. Although
radiocarbon dating of freshwater
mollusc remains indicated an age of about 7,500 years, radiocarbon dating in freshwater molluscs in particular can be inaccurate. Such inaccuracies, however, are always in the direction of objects appearing older than they actually are (containing less 14C than expected), so the time given is a maximum age of a freshwater shoreline at that location
http://religion.wikia.com/wiki/Atlantis
In Plato's account, Atlantis was a naval power lying "in front of the
Pillars of Hercules" that conquered many parts of Western Europe and
Africa 9,000 years before the time of Solon, or approximately 9600 BCE. After a failed attempt to invade Athens, Atlantis sank into the ocean "in a single day and night of misfortune".