[blam]

"Given the 400 ft sea level rise ( covering where early cities would have been logically built), you can only wonder."

Many believe it was closer to 500 ft.

[SunkenCiv]

And even more, as much as 800 feet, in the case of the Bering land bridge. Just depends on the locations of the ice, isostatic rebound, rotation rate of the Earth... :')