Adam Clarke on Job 26:7

He stretcheth out the north over the empty place - על תהו al tohu, to the hollow waste. The same word as is used, Gen 1:2, The earth was without form, תהו tohu. The north must here mean the north pole, or northern hemisphere; and perhaps what is here stated may refer to the opinion that the earth was a vast extended plain, and the heavens poised upon it, resting on this plain all round the horizon. Of the south the inhabitants of Idumea knew nothing; nor could they have any notion of inhabitants in that hemisphere.

Hangeth the earth upon nothing - The Chaldee says: "He lays the earth upon the waters, nothing sustaining it."