The beliefs and practices of the Sumerians and Akkadians, and their successors, the Babylonians and Assyrians. They inhabited ancient Mesopotamia in the millennia before the Christian era. These religious beliefs and practices form a single stream of tradition. Sumerian in origin, Mesopotamian religion was added to and subtly modified by the Akkadians in subsequent years.
Mesopotamia was a region between the rivers Tigris and Euphrates in western Asia. In general terms, it constitutes the greater part of what is now Irag. It was one of the cradles of human civilization. The name is Greek, meaning "Land Between the Rivers".