The Bactria–Margiana Archaeological Complex (or BMAC, also known as the Oxus civilisation) is the modern archaeological designation for a Bronze Age civilisation of Central Asia, dated to ca. 2300–1700 BCE, located in present-day northern Afghanistan, eastern Turkmenistan, southern Uzbekistan and western Tajikistan, centred on the upper Amu Darya (Oxus River). Its sites were discovered and named by the Soviet archaeologist Viktor Sarianidi (1976). Bactria was the Greek name for the area of Bactra (modern Balkh), in what is now northern Afghanistan, and Margiana was the Greek name for the Persian satrapy of Margu, the capital of which was Merv, in modern-day southeastern Turkmenistan.
Sarianidi's excavations from the late 1970s onward revealed numerous monumental structures in many sites, fortified by impressive walls and gates. Reports on the BMAC were mostly confined to Soviet journals, until the last years of the Soviet Union, so the findings were largely unknown to the West until Sarianidi's work began to be translated in the 1990s.
There is archaeological evidence of settlement in the well-watered northern foothills of the Kopet Dag during the Neolithic period. This region is dotted with the multi-period hallmarks characteristic of the ancient Near East, similar to those southwest of the Kopet Dag in the Gorgan Plain in Iran. At Jeitun (or Djeitun), mud brick houses were first occupied c. 6000 BCE. The inhabitants were farmers who kept herds of goats and sheep and grew wheat and barley, with origins in southwest Asia. Jeitun has given its name to the whole Neolithic period in the northern foothills of the Kopet Dag. At the late Neolithic site of Chagylly Depe, farmers increasingly grew the kinds of crops that are typically associated with irrigation in an arid environment, such as hexaploid bread wheat, which became predominant during the Chalcolithic period.