Genesis 10:32
30 Their dwelling place was from Mesha all the way to Sephar in the eastern hills. 31 These are the sons of Shem according to their families, according to their languages, by their lands, and according to their nations. 32 These are the families of the sons of Noah, according to their genealogies, by their nations, and from these the nations spread over the earth after the flood.
Jubilees 8:8
8 And in the sixth year [1567 A.M.] thereof, she bare him son, and he called his name Peleg; for in the days when he was born the children of Noah began to divide the earth amongst themselves: for this reason he called his name Peleg. 9 And they divided (it) secretly amongst themselves, and told it to Noah. 10 And it came to pass in the beginning of the thirty-third jubilee [1569 A.M.] that they divided the earth into three parts, for Shem and Ham and Japheth, according to the inheritance of each, in the first year in the first week, when one of us who had been sent, was with them.
Notes and References
"... Genesis concluded that same chapter by saying: “These are the groupings of Noah’s descendants ... and from these the nations branched out over the earth after the food,” that is, they branched out according to the way Noah’s descendants had divided things up. Tere was a problem, however: the next chapter of Genesis begins with the story of the Tower of Babel, which depicts all of humanity as still being one large family, with everyone having “the same language and the same words” and everyone settling together “in a valley in the land of Shinar” (Genesis 11:1-2). So did they split up or did they not? Jubilees’ author seeks to resolve this difficulty by saying that Noah’s sons had divided the earth in a bad way among themselves, necessitating a second division by Noah himself. ..."
Kugel, James L. A Walk through Jubilees: Studies in the Book of Jubilees and the World of Its Creation (p. 76) Brill, 2012