Ancient Egyptian civilization developed along the fertile Nile River valley from around 3100 BCE to 1200 BCE. The Pharaoh owned all the land and farmers had to pay taxes to him in the form of a portion of the food they grew. Farming depended on the predictable annual flooding of the Nile. There were three seasons: flooding, sowing, and harvest. Egyptians developed irrigation systems and tools like the shaduf to water their crops. Settlements grew into cities as people discovered the resources of the Nile valley. The river valley was protected and provided water for survival, allowing the development of Egyptian civilization and a division of labor between farmers and specialists.