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Looking west along the southern wall of Early Bronze Age Arad. This solid wall is about 10' thick. Note the semi–circular tower [left center of image]. Thick city walls with semi-circular towers attached to them are characteristic of Early Bronze Age cities (compare et–Tell, Yarmuth, etc.).
For a brief description of the historical significance of Arad Click Here.
Image from the Zondervan Atlas of the Bible, p. 89.