Ur was a city in the region of Sumer, southern Mesopotamia, in what is modern-day Iraq.
According to biblical tradition, the city is named after the man who founded the first settlement there, Ur, though this has been disputed. The city’s other biblical link is to the patriarch Abraham who left Ur to settle in the land of Canaan. This claim has also been contested by scholars who believe that Abraham’s home was further north in Mesopotamia in a place called Ura, near the city of Harran, and that the writers of the biblical narrative in the Book of Genesis confused the two. Whatever its biblical connections may have been, Ur was a significant port city on the Persian Gulf which began, most likely, as a small village in the Ubaid Period of Mesopotamian history (5000-4100 BCE) and was an established city by 3800 BCE continually inhabited until 450 BCE.

extracted from https://www.ancient.eu/ur/