וְשֵׁ֨ם הַנָּהָ֤ר הַשְּׁלִישִׁי֙ חִדֶּ֔קֶל ה֥וּא הַֽהֹלֵ֖ךְ קִדְמַ֣ת אַשּׁ֑וּר וְהַנָּהָ֥ר הָֽרְבִיעִ֖י ה֥וּא פְרָֽת׃
第三條河名叫希底結，它流經亞述的東邊；第四條河就是幼發拉底河。
The Midrash of Philo
Why it is that he not only describes the situation of the Euphrates, but also says that the Phison goes round all the land of Evilat, and that the Gihon goes round all the land of Ethiopia, and that the Tigris goes toward Assyria? (Genesis 2:14).