http://en.wikipedia.org/wiki/Image:IE5500BP.png
Proto-Indo-European languages "Yamna-Maikop" ?? Strange its NNE of the Black Sea.
Black Sea Deluge theory: http://en.wikipedia.org/wiki/Black_Sea_deluge_theory Sounds fun. But maybe they might got it backwards, if one year, 10,000 years ago a bunch of glaciers rapidly melted in Siberia they would flow down into the Black Sea, then the Black Sea would overflow into the Mediterranian, not the other way around. But oh well, one way or another there is a Deluge Story in every culture on Earth.
The old egyptian priest story of how the ocean got "muddy" and "Unavigable" would also go with decades of flooding from melting glaciers from the last ice age. Maybe ancient mariners gave up, told stories about muddy unnaviable waters" because of the waters going through that straight seperating the Mediterranean and the Black Sea wasa torrent for decades. Who knows.
So I poked around the area the Proto-Indo-European languages began, looking for river deltas and flat land, what do you think about this spot:
GOOGLE EARTH:
47 12 40.00 N
39 46 50.00 E
Maybe the river cut through the little circular "Atlantis" Rivers do change course. It would be more or less a river-fortress then an actual city.