When Abraham lived there it was a seaside town. Today it is about 100 miles inland. (Silting) BTW, during the Ice Age, the Persian Gulf was completely dry.
Whilst searching for the origin of the star and crescent symbol, found this:
SUMERIANS ARE NOT INDIGENEOUS PEOPLE TO MESOPOTAMIA
It is well acknowledged that the Sumerians are not indigeneous people to Mesopotamia. In view of the existing close kinship of Sumerian and the Ural-Altaic languages and additionally many cultural evidences showing direct kinship betwen the Sumerians and the Central Asiatic peoples, it can be said that in order for this affinity to exists, the ancestors of the present day Altaic peoples (such as Turks and Hungarians) and those of the Sumerians must have been in direct contact with each other before Sumerians migrated into Mesopotamia. In other words, the Sumerians must have been a Central Asiatic people and must have been speaking the same or a dialect of a proto-Ural-Altaic language that Ural-Altaic peoples spoke then. That proto-Ural-Altaic language must have been either the same as the Sumerian or a version of the Sumerian language that the linguists have been able to read from thousands of Sumerian tablets. The very fact that the present day Turkish and Hungarian are Sumerian-like languages, is a strong indication that the speakers of these languages are the descendants of an Ural-Altaic people who must have been members of a group that the Sumerians were also a member.
http://www.compmore.net/~tntr/crescent_starb.html