Book of Jubilees 8:12
And there came forth on the writing as Shem's lot the middle of the earth which he should take as an inheritance for himself and for his sons for the generations of eternity, from the middle of the mountain range of Rafa, from the mouth of the water from the river Tina, and his portion goes towards the west through the midst of this river, and it extends till it reaches the water of the abysses, out of which this river goes forth and pours its waters into the sea Me'at, and this river flows into the great sea. And all that is towards the north is Japheth's, and all that is towards the south belongs to Shem.
Background and history of Book of Jubilees, and issues with this book.
R. H. Charles, The Book of Jubilees, in The Apocrypha and Pseudepigrapha of the Old Testament, vol. 2 (Oxford: Clarendon Press, 1913). Public domain in the United States (published 1913). Charles died in 1931, so the book is in the public domain in the United Kingdom. The verse text is the Joshua Williams transcription at pseudepigrapha.com. Jubilees 1:8 and 1:9 are divided at the break in the 1902 Clarendon scan (archive.org bookofjubileesor00char), where verse 9 begins “For they will forget.” That scan also numbers the angel-of-the-presence sentence as 1:29. Editorial brackets in the translation are Charles’s.