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It was a river valley.
it was relatively flat
The Fertile Crescent is in the current countries of Iraq, Syria, Lebanon, Israel/Palestine, and Jordan.
There MIGHT be some species where that is the case, but usually - no. Mammals for instance, particularly humans, are NOT fertile every day.
The Fertile Crescent is in the modern-day countries of Israel, Palestine, Lebanon, Jordan, Syria, and Iraq.
Israel and America
The modern-day countries that occupy the Fertile Crescent are Iraq, Syria, Lebanon, Jordan, and Israel/Palestine.
Mostly Iraq, some other bits of countries.
Fertile Crescent.
The Fertile Crescent is in southwest Asia.
Iraq, Afghanistan, and other Middle Eastern countries around there.
The fertile crescent arches from Iraq, over to Syria, Lebanon, Jordan, Israel/Palestine, down to Egypt.