The oldest known wheel used for transportation was found by archaeologists in Mesopotamia. It is believed to date back to 3,500 B.C. However, wheels had been in use for hundreds of years before that to make pottery, as it is believed that potters' wheels existed since the Neolithic Era.
While the oldest wheel was found in Mesopotamia, modern day Iraq, linguistic evidence points to the Tripoyle people in modern day Ukraine, as words used to refer to wheels stem from the language of that culture. Also, the oldest drawings of wheels have been excavated in Poland, rather than the Middle East.