The fountains of the great deep are channels through the crust and mantle of the original Earth through which water drained into the great deep. They were later used to flood the Earth in the time of Noah.
The Fountains of the Great Deep
Highest part: וְ֝רֹ֗אשׁ – rosh
IF Eden was at the top of a mountain that filled the whole Earth, and a river from Eden watered the surface of the whole land, THEN the concept of elevation will be found in the scriptural context.
March 4th
We (me and the Holy spirit) confirm our hypothesis that Eden was the highest part of a mountain that filled the whole Earth: Why were there were no Cherubim or flaming swords on the North, West and South of Eden?