Mesopotamia was the site of the earliest civilization, located between the Tigris and Euphrates Rivers. Living in larger communities offered advantages like physical and material security as well as allowing cultural and moral values to flourish. Mesopotamian culture was rich in trade, warfare, and innovation - they invented writing, irrigation, mathematics, the wheel, and metalworking. Religion also played a central role, with each city centered around a ziggurat temple dedicated to patron gods who were believed to rule the natural world.