What is the "land between two rivers" as noted in the book, When God Was a Woman?

Mesopotamia designates the land "between the rivers" Tigris and Euphrates in what is now Iraq. In antiquity, it is rule by Sumer and Babylon. In Sumerian hymns, females precede males. Gilgamesh credits the invention of writing to a woman. The Sumerian Queen of Heaven, Inanna, is powerful and omnipotent, but over thirteen centuries evolves into the grieving Ishtar. Northern "battle ax cultures" make their way to Mesopotamia soon after 2000 BCE, transforming society into patrilineal descent patterns. The sixth king of Babylon, Hammurabi, who extends his empire to Mesopotamia, is most associated with one of the first written law codes.