What was the key geographical feature that was important to life in ancient Egypt?

The key geographical feature essential to life in ancient Egypt was the Nile River. It provided a reliable source of water for irrigation, enabling agriculture in an otherwise arid landscape. The annual flooding of the Nile deposited nutrient-rich silt on the surrounding land, facilitating the cultivation of crops such as wheat and barley. This agricultural abundance supported the growth of civilization and trade in ancient Egypt.