Lower Mesopotamia Persian Gulf and severely limits productivity in the region south of Al Amarah. The salinity is reflected in the large lake in central Iraq, southwest of Baghdad, known as Bahr al Milh (Sea of Salt). There are two other major lakes in the country to the north of Bahr al Milh: Buhayrat ath Tharthar and Buhayrat al Habbaniyah. Lower Mesopotamia Lower Mesopotamia is a historical region of Iraq. Also known as the Sawad and al-'Irāq al-'Arabi ("Arabian Irāq") in the Middle Ages. Lower Mesopotamia was home to ancient Sumerian and Babylonian civilisations. An alluvial plain begins north of Baghdad and
Early Dynastic Period (Mesopotamia) as local exchange and production centres but do not seem to have been capitals of larger political entities. The further development of maritime trade in the Persian Gulf led to increased contacts between Lower Mesopotamia and other regions. Starting in the previous period, the area of modern-day Oman—known in ancient texts as Magan—had seen the development of the oasis settlement system. This system relied on irrigation agriculture in areas with perennial springs. Magan owed its good position in the trade network to its copper deposits. These deposits were located in the mountains, notably near Hili, where copper workshops and monumental