At Tepe Hissar (northeastern Iran), intensified craft production and exchange—especially metalworking and gemstone processing—helped anchor an interaction sphere linking communities across the Iranian Plateau, Afghanistan/Central Asia, and areas connected to the Indus world in the later 4th–early 3rd millennium BCE.
In southeastern Iran, the major urban center of Shahr-e Sukhteh (Burnt City) participated in wide-ranging exchange networks during the 3rd millennium BCE; finds there are frequently discussed as part of broader east–west contacts relevant to Indus-linked trade and technology transmission.
Production and circulation of carved softstone (chlorite/steatite) vessels in the widely distributed “Intercultural Style” expanded in the later 3rd millennium BCE, with Tepe Yahya and southeastern Iran as key production zones and findspots extending as far as the Indus Valley—evidence for connected elite exchange networks across Iran and beyond.
Archaeological research in the Halil River/Jiroft region indicates a florescence around 2500–2200 BCE, often associated with “Intercultural Style” objects and exchange routes spanning southeastern Iran, the Gulf, Mesopotamia, and contacts eastward toward the Indus sphere.
Gonur Depe in the Murghab oasis (Turkmenistan), often described as a principal BMAC settlement, dates broadly within the 3rd–2nd millennium BCE and is frequently cited in discussions of long-distance contacts (including objects interpreted as linking Central Asia with the Indus sphere).
At Mundigak (Helmand region, Afghanistan), later 3rd millennium BCE material culture is reported to indicate interaction with areas including Baluchistan and the Early Harappan/Indus region, illustrating that exchange corridors around the Iranian Plateau’s eastern approaches were active well before (and alongside) mature Indus–BMAC contacts.
The Bactria–Margiana Archaeological Complex (Oxus Civilization) developed major fortified centers and distinctive material culture in southern Central Asia during the Middle Bronze Age (commonly placed broadly in the late 3rd–early 2nd millennium BCE), creating a key northern counterpart for interaction with Iran and the Indus world.
At Altyn Depe (southern Turkmenistan), excavations have reported Indus Valley–type objects—especially stamp seals and ivory items—supporting the view that the Kopet Dag/BMAC sphere had sustained exchange connections with communities tied to the Indus Civilization.
Shortugai, in northern Afghanistan on the Amu Darya (Oxus), is widely interpreted as a Harappan trading outpost established around 2000 BCE—often linked to access routes toward Central Asia and resources such as lapis lazuli—highlighting direct Indus presence beyond the Iranian Plateau’s eastern margins.
Sutkagen Dor on the Makran coast (near the Iran–Pakistan frontier) is described as the westernmost known Indus Valley Civilization site, signaling Indus participation in overland/coastal corridors leading toward southeastern Iran and the broader Iranian Plateau contact zone.
Syntheses of BMAC interaction describe finds interpreted as long-distance contacts—such as Harappan-type seals and other Indic-linked items reported at key BMAC sites (e.g., Gonur Depe), alongside other western items (e.g., Elamite-style cylinder seals)—indicating multidirectional exchange across Central Asia, Iran, and the Indus sphere.
A circular “Persian Gulf” type seal discovered at the Indus port town of Lothal provided early scholarly-cited archaeological evidence connecting Indus trade to Gulf entrepôts (often associated with Dilmun/Bahrain) within wider interregional exchange systems that also linked to the Iranian Plateau.
Around 1900 BCE, many walled BMAC centers are reported to shrink markedly, a change often discussed as part of broader shifts in Central Asian settlement and exchange patterns that also frame the waning of some long-distance contacts at the end of the Mature Harappan period.
Reports of Indus-associated materials (e.g., ivory and seal-related items) in Kopet Dag/BMAC contexts are commonly placed into the late 3rd–early 2nd millennium BCE, suggesting that elements of Indus–Central Asian exchange continued into the period when BMAC societies were transforming.
Michael CarricoIndus Contacts with the Iranian Plateau and the Bactria–Margiana Complex (c. 3000–1900 BCE)