Quite simple, actually,
since Egypt is near the fertile Nile..it can easily be viewed as a gift.
The Nile river helped make an amazing, and beautiful civilization out of Egypt. Another factor that contributed is that the Nile also contributed to Egypt's economy...if you notice how Egypt looks like...there's these three pyramids..The Great Three Pyramids. That definitely shows how wealthy the Egyptians were to build such a wonder!
Today, we still find artifacts, priceless, proving the fact that Egypt was "the gift to the Nile."