Overland routes in Mesopotamia usually follow the Euphrates because the banks of the Tigris are frequently steep and difficult.

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Wikipedia contributors. (2023, October 31). Mesopotamia. In Wikipedia, The Free Encyclopedia. Retrieved November 3, 2023, from https://en.wikipedia.org/w/index.php?title=Mesopotamia&oldid=1182868875

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Columbia River Basalt Group (Wikipedia) The Columbia River Basalt Group is the youngest, smallest and one of the best-preserved continental flood basalt province on Earth, covering over 210,000 km2 (81,000 sq mi) mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. The basalt group includes the Steens and Picture Gorge basalt formations.

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Mesopotamia (Wikipedia) Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia occupies modern Iraq. In the broader sense, the historical region included present-day Iraq and parts of present-day Iran, Kuwait, Syria and Turkey.

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Mesopotamia
Euphrates River
Tigris River
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