The only question to me is whether at the time of Noah's flood the continents were actually situated on the globe in the same locations as they are today (or at least close...). The idea of one continent ~ Pangaea ~ is generally accepted, and in my view, it is
possible that this was the state of the land and that Noah's flood was all-encompassing regarding the
land, but not actually
global. Yes, I realize that even in that case, water would have covered the whole earth....
To that point, though, there is a good number of Christians who think the result of the events that took place in Genesis 11, particularly verse 8 and 9...
"So the Lord dispersed them from there..." (the plain in the land of Shinar) "...over the face of all the earth, and they left off building the city. Therefore its name was called Babel, because there the Lord con-fused the language of all the earth."
NOTE: Yes, I know there's no hyphen in con-fused, but the board was putting in a confused emoticon in there... <smile>
"And from there the Lord dispersed them over the face of all the earth"
..is not just evidence of scattering/moving people (or even migration, in humanistic terms)... but even
the land masses themselves.
Something to think about, anyway... <
smile>
Grace and peace to all.