Around 2600 BCE, the Indus (Harappan) civilization entered its most urbanized period, with large planned cities and wide regional integration. This expansion created the scale and surplus that made regular long-distance exchange practical, including sea-linked trade toward the Persian Gulf and Mesopotamia.
By about 2600–2450 BCE, Indus-region goods—especially carnelian (a red gemstone often used for beads)—appear in Early Dynastic contexts at Ur. These finds suggest that luxury materials and finished ornaments from the Indus were entering Mesopotamian exchange networks early in the relationship.
During the third millennium BCE, intermediate ports in the Persian Gulf—later remembered as places like Dilmun—helped move goods between South Asia and Mesopotamia. This “step-by-step” system reduced the risks of very long voyages and made trade more regular by linking shorter sailing legs.
Indus seals and sealings (clay impressions used to secure bundles or containers) indicate organized handling of goods and ownership control. Similar evidence—Indus-related seals and impressions—found in Mesopotamia supports the idea that Indus merchants and/or their cargoes were present within Mesopotamian trading cities.
Lothal, in today’s Gujarat, became a notable Harappan settlement associated with maritime activity and trade administration, including many sealings found at the site. Its coastal setting helped link inland production zones to sea routes leading toward the Persian Gulf and beyond.
In later copies of a Sargon of Akkad inscription, ships from Dilmun, Magan, and Meluhha are said to have been moored at the quay of Akkad (Agade). While the text survives through later transmission, it shows that “Meluhha” was recognized in Mesopotamia as part of an overseas trade world connected by Gulf shipping.
An inscription attributed to Naram-Sin refers to a “man of Meluhha,” often discussed as evidence that Mesopotamians viewed Meluhha as a distinct foreign polity or region. Even if the political details remain unclear, the mention supports the idea that Indus-linked people and goods were known at royal levels in Mesopotamia.
Texts associated with Gudea of Lagash describe obtaining valued stones such as carnelian and lapis lazuli, including items identified as coming from Meluhha. Temple building projects were major consumers of prestige materials, so these references show how long-distance trade fed elite and religious demand.
Scholarly summaries commonly place the high point of Indus–Mesopotamia exchange in the later third millennium BCE, especially during the Akkadian and Ur III periods. This was a time of strong state institutions in Mesopotamia, which could support repeated procurement of foreign materials through merchants, ports, and administrative systems.
A “Persian Gulf” style circular stamped seal found at Lothal resembles seals used in Gulf trading communities, suggesting close links between Harappan ports and Gulf entrepôts. This kind of artifact supports a picture of mixed trading practices and shared tools for identifying traders or cargo in a multilingual exchange zone.
After about 1900 BCE, the Indus civilization’s major urban centers declined and regional patterns changed, reducing the scale of long-distance commercial activity. This shift is often linked to environmental and economic stresses that made maintaining large cities and far-reaching exchange networks more difficult.
Mesopotamian texts stop mentioning Meluhha in later periods, indicating that the earlier, well-recognized trade connection had weakened or ended. The disappearance of both textual references and many identifiable Indus trade markers in Mesopotamia marks a clear closing outcome: a long-running maritime exchange system had largely broken down by the early second millennium BCE.
Harappan (Indus Valley) maritime trade with Mesopotamia (c. 2600–1900 BCE)