Which civilization developed on the banks of the River Tigris?

The Sumerian Civilization represents the first recorded society in the region of Mesopotamia—a name which translates to 'the place between two rivers' in the original Greek tongue. It began in the fertile valleys carved by the Tigris and Euphrates rivers in what is now Iraq. Using the rivers to conduct their farming, commerce, and navigation, the Sumerians developed a highly advanced irrigation process to stabilize the rivers from their yearly flooding.