History › First civilizations › Bronze Age
Indus Valley civilization
c. 2600–1900 BC (mature phase)· Empire, kingdom or state· Asia
Well documentedSolid records, physical evidence or scientific consensus.
A large Bronze Age civilization of planned cities along the Indus River, in today's Pakistan and northwest India.
See it on the History map →What happened
At its peak it covered more land than Egypt or Mesopotamia, with perhaps a million people or more (estimates vary). Cities such as Harappa and Mohenjo-daro had grid streets, baked-brick houses, covered drains and standardized weights and brick sizes. No palaces or grand royal tombs have been found, suggesting an unusual, less centralized kind of rule. Traders reached Mesopotamia by sea. From about 1900 BC the cities emptied, probably as rivers shifted and monsoon rains weakened.
Why it matters
It shows that early cities could be well planned and prosperous without obvious kings, and it was one root of later South Asian culture.
Think of it like
Like a master-planned development with uniform lots, standard bricks and shared sewers, but no obvious developer's headquarters.
How we know
Excavations since the 1920s at Harappa, Mohenjo-daro, Dholavira and Rakhigarhi; thousands of carved stone seals; Indus beads and seals found in Mesopotamian cities.
Still debated
The Indus script, known from thousands of short inscriptions, is still undeciphered; who ruled, and exactly why the cities declined, remain open questions.
Inside this (1)
Connections (2)
▸Sumer and Mesopotamia: the first cities traded by sea with Indus Valley civilizationWell documented
The connection
Mesopotamian texts describe ships from 'Meluhha', almost certainly the Indus region, bringing carnelian beads, ivory, timber and gold. Trade moved along the Persian Gulf via Dilmun (Bahrain) and Magan (Oman). Indus merchants may have lived in Mesopotamian cities; Mesopotamian goods turn up at Indus sites too, though more rarely.
When and how
The Persian Gulf and Arabian Sea, about 2500–1900 BC, especially during the Akkadian Empire and the later Ur III kingdom.
How we know
Indus seals and etched carnelian beads at Ur and other cities; Sargon's boast of ships from Meluhha docking at Akkad; Gulf ports in Bahrain using Indus-standard weights.
Debates and open questions
What Mesopotamia sent back is unclear, perhaps textiles, wool or silver that leave little trace; identifying Meluhha with the Indus is near-certain but unproven.
▸Indus Valley civilization declined before the rise of Vedic India and the roots of HinduismMostly agreed
The connection
From about 1900 BC the Indus cities emptied, probably as rivers shifted, monsoon rains weakened and trade with Mesopotamia faded; people dispersed into villages to the east and south. Over the following centuries, most scholars think, Indo-Aryan-speaking groups arrived from Central Asia and composed the Vedas. The old theory of Aryans conquering the cities is rejected: the decline came first.
When and how
Northwest South Asia (the Punjab and nearby), about 1900–1200 BC.
How sure are we?
Archaeology shows the cities declining before Vedic-era sites appear; climate records show drying; ancient DNA shows steppe ancestry arriving around 2000–1500 BC.
Debates and open questions
How much Indus culture fed into Vedic religion and later Hinduism, through seal images or water rituals, is debated, as are the details of the Indo-Aryan arrival.