The natural feature that is a source of the Nile River is Lake Victoria. This vast lake, located in East Africa and bordered by Uganda, Tanzania, and Kenya, feeds the river as it flows northward. The Nile is considered one of the longest rivers in the world, and it has been crucial for the civilizations of Egypt and Sudan throughout history, providing water, transportation, and fertile land. The region surrounding Lake Victoria is also rich in biodiversity, making it an essential ecological area.