The Nile River was essential for the development of ancient Egyptian civilization. It provided fertile land for farming through annual flooding and served as the primary transportation route. The flooding also deposited rich soil that made the land along the Nile highly productive. This productivity, along with Egypt's protected geographical position, allowed ancient Egyptian civilization to develop its own unique culture and architecture over millennia. The pharaoh was the absolute ruler, and religion and government were tightly intertwined. Egyptian society was highly stratified, but social mobility was possible through professions like scribe. Hieroglyphic writing and numerous artistic achievements demonstrate the advanced nature of ancient Egyptian civilization.