The Sumerians are recognized as the first civilization around 3,500 BC. Sumer was located near the Persian Gulf in the Middle East. Prior to this people were nomadic. They hunted and gathered to survive. They moved as the conditions changed . The Sumerians were a clever people they developed the first writing system and lunar calender. They also developed the plow and sail boat. They started growing their own crops through necessity as hunting was not a sustainable way of life on its own.The reign of the Sumerians ended around 2000 BC when the Babylonians overthrew them. The Babylonians kept the cultural gains made by the Sumerians.This was the first city on earth.