וַתְּהִ֨י רֵאשִׁ֤ית מַמְלַכְתּוֹ֙ בָּבֶ֔ל וְאֶ֖רֶךְ וְאַכַּ֣ד וְכַלְנֵ֑ה בְּאֶ֖רֶץ שִׁנְעָֽר׃
And the beginning of his kingdom was Babel, and Erech, and Accad, and Calneh, in the land of Shinar.
Read kabbalistic (mystical) interpretation of Genesis 10:10: and classical mystical sources.