Reference for Bekhorot 110:6

אמר רב נחמן בר יצחק ואיתימא רב אחא בר יעקב

is Yubal [river] because Scripture says: For he shall be like a tree planted by the waters and that spreadeth the roots by the river [Yubal].<span class="x" onmousemove="('comment',' Jer. XVII, 8, referring to the Tree of Life and the Tree of Life was in the Garden of Eden, the Euphrates watering the Garden of Eden.');">⁵</span>

Jastrow