You have the Tigris and the Euphrates, where you have Mesopotamia, Babylonia, those early early civilizations develop into city-states. You have the Yellow River in China, very early civilizations are developing there, as well as river systems like the Amazon in South America with maybe the Mayans, and that being the central kind of aspect of them developing their civilizations. So river valleys, fertile soil, grow food, Neolithic, put the animals in a cage, yummy, yummy, yummy. I'm a vegetarian, I eat the corn though. All right guys, let's go see if I can't find a mountain. You think that'd be easy to find? Just throw a rock at the mountain.