see the map of Mesopotamia
In the narrow sense, Mesopotamia is the area between the Euphrates and Tigris rivers, north or northwest of the bottleneck at Baghdad, in modern Iraq; it is Al-Jazirah ("The Island") of the Arabs. South of this lies Babylonia, named after the city of Babylon. However, in the broader sense, the name Mesopotamia has come to be used for the area bounded on the northeast by the Zagros Mountains and on the southwest by the edge of the Arabian Plateau and stretching from the Persian Gulf in the southeast to the spurs of the Anti-Taurus Mountains in the northwest.
Only from the latitude of Baghdad do the Euphrates and Tigris truly become twin rivers, the Rafidain of the Arabs, which have constantly changed their courses over the millennia. The low-lying plain of the Karun River in Persia has always been closely related to Mesopotamia, but it is NOT considered part of Mesopotamia as it forms its own river system.
Mesopotamia, south of Ar-Ramadi (about 70 miles, or 110 kilometres, west of Baghdad) on the Euphrates and the bend of the Tigris below Samarra' (about 70 miles north-northwest of Baghdad), is flat alluvial land. Between Baghdad and the mouth of the Shatt al-'Arab (the confluence of the Tigris and Euphrates, where it empties into the Persian Gulf) there is a difference in height of only about 100 feet (30 metres). As a result of the slow flow of the water, there are heavy deposits of silt, and the riverbeds are raised. Consequently, the rivers often overflow their banks (and may even change their course) when they are not protected by high dikes. In recent times they have been regulated above Baghdad by the use of escape channels with overflow reservoirs. The extreme south is a region of extensive marshes and reed swamps, Hawrs, which, probably since early times, have served as an area of refuge for oppressed and displaced peoples.
The supply of water is not regular; as a result of the high average temperatures and a very low annual rainfall, the ground of the plain of latitude 35 N is hard and dry and unsuitable for plant cultivation for at least eight months in the year. Consequently, agriculture without risk of crop failure, which seems to have begun in the higher rainfall zones and in the hilly borders of Mesopotamia in the 10th millennium BC, began in Mesopotamia itself, the real heart of the civilization, only after artificial irrigation had been invented, bringing water to large stretches of territory through a widely branching network of canals. Since the ground is extremely fertile and, with irrigation and the necessary drainage, will produce in abundance, southern Mesopotamia became a land of plenty that could support a considerable population. The cultural superiority of north Mesopotamia, which may have lasted until about 4000 BC, was finally overtaken by the south when the people there had responded to the challenge of their situation.
The present climatic conditions are fairly similar to those of 8,000 years ago. An English survey of ruined settlements in the area 30 miles around ancient Hatra (180 miles northwest of Baghdad) has shown that the southern limits of the zone in which agriculture is possible without artificial irrigation has remained unchanged since the first settlement of Al-Jazirah.
The availability of raw materials is a historical factor of great importance, as is the dependence on those materials that had to be imported. In Mesopotamia, agricultural products and those from stock breeding, fisheries, date palm cultivation, and reed industries [in short, grain, vegetables, meat, leather, wool, horn, fish, dates, and reed and plant-fibre products] were available in plenty and could easily be produced in excess of home requirements to be exported. There are bitumen springs at Hit (90 miles northwest of Baghdad) on the Euphrates (the Is of Herodotus). On the other hand, wood, stone, and metal were rare or even entirely absent. The date palm--virtually the national tree of Iraq--yields a wood suitable only for rough beams and not for finer work. Stone is mostly lacking in southern Mesopotamia, although limestone is quarried in the desert about 35 miles to the west and "Mosul marble" is found not far from the Tigris in its middle reaches. Metal can only be obtained in the mountains, and the same is true of precious and semiprecious stones. Consequently, southern Mesopotamia in particular was destined to be a land of trade from the start.
Only rarely could "empires" extending over a wider area guarantee themselves imports by plundering or by subjecting neighbouring regions. The raw material that epitomizes Mesopotamian civilization is clay: in the almost exclusively mud-brick architecture and in the number and variety of clay figurines and pottery artifacts, Mesopotamia bears the stamp of clay as does no other civilization, and nowhere in the world but in Mesopotamia and the regions over which its influence was diffused was clay used as the vehicle for writing. Such phrases as cuneiform civilization, cuneiform literature, and cuneiform law can apply only where people had had the idea of using soft clay not only for bricks and jars and for the jar stoppers on which a seal could be impressed as a mark of ownership but also as the vehicle for impressed signs to which established meanings were assigned--an intellectual achievement that amounted to nothing less than the invention of writing.
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