The land between the Tigris River and the Euphrates River is commonly known as <em>the Fertile Crescent</em>, in that there was a abundance of rich soil commonly known as silt [see picture #1], which allows for retaining of water and allow for larger proportions of air to interact with the plant, which allows for it to grow.
This rich soil is especially good for farming in greater proportions, and coupled with favorable environments, allowed for large amounts of farming. The land in particularly is semi-arid, which gives a dry and more firm ground, but coupled with the rivers which provide adequate amounts of water and silt, it allows for farming to occur in the region.
Now in defining the region and how it provides the necessary ingredients to allow for bountiful harvests, it means that civilizations in the region is able to 1) settle in place and harvest their necessary crops. 2) have the ability to domesticate animals and use them depending on what animal it is, from providing milk, meat, and even hides, to being used to move larger objects that are too heavy for men (such as chiseled rocks). Having an environment that can sustain such animals allow for population growth as well as culture expansions that lead to development.
In this, the foundation of human needs are met. Firstly, the need of water is met with the rivers, food is also met with the development of farms in access to the fertile crescent, and finally, the development of homes are allowed due to the abundance of food and materials in which to build the homes. This allows for civilization to expand past the necessities, and build up their own ideals and systems. Cities are able to develop simply because the land supports and provides the due necessities for humanity to prosper.
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Learn more about the Fertile Crescent, here:
brainly.com/question/3672608 - Location of the Fertile Crescent.