“In the days of Pelegg was the world divided” Genesis. It doesn’t say the “people scattered” as in the Babel account. The pangea break up may have been a much more recent, rapid, and spiritually engineered geological event!
The world prior to the comet impact was much different - large bodies of water existed, but they were unconnected. So the world as known to the ancients was divided. For instance, Atlantis was east of the mid-Atlantic ridge, west of what we now call the Gibraltar Strait. There was a body of water to its east.
The ‘Pangea’ break-up is explained here (not yet ‘accepted’ geology):
http://www.threeimpacts-twoevents.com/wp-content/uploads/2013/05/Geologic-Sensemaking-Simultaneous-Impacts-10May2013.pdf