What nation was called "the gift of the Nile"?

Egypt.

The Greek historian Herodotus called Egypt the "gift of the Nile", since the kingdom owed its survival to the annual flooding of the Nile and the resulting depositing of fertile silt. The Nile River flows into the Mediterranean Sea, and there is a delta at the mouth.

Egypt is known as the gift of the Nile. This is because the country thrived on the resources that the Nile provided. Egypt is known as the gift of the Nile.