There is no relation.
Mesopotamia
the soil was fertile
A fertile river valley is a depression in the earth through which a river runs. The soil in the area of these valleys is able grow and abundance of crops.
The Fertile Crescent is a region in the Near East often incorrectly extended to Egypt. The links below will give you ample details to compare them.
Some where in the fertile river valley. ^^Whoever gave that answer sucks.
contains the River Nile
It was a river valley.
It was a close resource for water and it supplied water to people's farmland and it had fertile soil.
the silt that river nile carriedwhen it flooded every year caused the land to be extremely fertile.
to have fertile land to farm
They wanted fertile land.
because it just is.