Gen. 1:2
"And the earth was without form and void; and darkness was upon the face of the deep (tehom - as in surging mass of water, i.e. main sea deep supply of water, depth, lit. waters)."
Proverbs 8:27
"When He prepared the heavens I was there:, When He set a compass (Chuwg) upon the face of the deep."
To compass the face of the waters on all sides is to form a sphere, face is the surface, not the edge, to set a compass upon the surface, from all sides, as God is omnipotent, encompassing the waters and the earth on all sides is to form a sphere. This is clear in Biblical teaching, there is no reason to doubt this or suggest otherwise.