God made the dry land appear on the third day. The dry ground is, obviously, the surface of the Earth. For our purposes the surface of the Earth is considered to be a feature of the crust.
The Dry Land
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 3rd
Where did the water come from which watered the surface of the land? it up welled at Eden. Now, here's the real question, how did the water get to Eden if there hadn't been any rain?
The Logic of Eden
The logic of Eden is deduced from a simple observation: IF rivers from Eden watered the surface of the Earth, AND water flows downhill, THEN Eden must have been the highest point on the Earth.