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A natural barrier refers to a physical feature that protects or hinders travel through or over.

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A member of the indigenous non-Semitic people of ancient Babylonia.

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The Zagros Mountains form the largest mountain range in Iran, Iraq and southeastern Turkey.

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An embankment built to prevent the overflow of a river.

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A system of supplying (land) with water by means of artificial canals, ditches, etc, esp to promote the growth of food crops.

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The Euphrates is the longest and one of the most historically important rivers of Western Asia.

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The Tigris is the eastern member of the two great rivers that define Mesopotamia, the other being the Euphrates.

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A city that with its surrounding territory forms an independent state.

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The southernmost region of ancient Mesopotamia which is generally considered the cradle of civilization.

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The geografic area located between the Tigris and Euphrates Rivers.