The document provides an outline for a lecture on the four early river valley civilizations, with a focus on the Sumerian civilization in Mesopotamia. It discusses the geography of the region between the Tigris and Euphrates Rivers that led to the development of cities. It describes key aspects of Sumerian culture, including their religion, social structure, and scientific/technological achievements. It also discusses the city-state form of government and the first empire builders like Sargon of Akkad and the Babylonian Empire under Hammurabi.