How might the Nile's river cataracts have both helped and hurt Egypt?

The Nile's river cataracts provided a natural barrier against invasions, helping to protect ancient Egypt from hostile forces and contributing to its stability and growth. However, these cataracts also posed challenges for navigation and trade, making it difficult to transport goods upstream. While they safeguarded the region, the cataracts limited economic expansion and interaction with other cultures, impacting Egypt's overall development.