Mohenjo-daro

Timeline

1. c. 7000 BC

   Mehrgarh culture

   Agricultural culture begins in Balochistan, the long preparatory phase that gives rise to Indus Civilization.

2. c. 2600 BC

   Urbanization

   Harappa and Mohenjo-daro blossom as cities, marking the mature Harappan phase of the Indus Civilization.

3. c. 2500 BC

   Mohenjo-daro founded

   Foundations of the principal structures are laid; planned city and water infrastructure complete; population reaches 30,000-40,000.

4. c. 1900 BC

   Decline begins

   Climate desiccation and Indus channel shifts trigger decline; urban maintenance collapses and population disperses.

5. c. 1500 BC

   City abandoned

   Mohenjo-daro is fully abandoned; the urban civilization of the Indus Valley reaches its historical end.

6. 2nd-5th c. CE

   Stupa built

   A Kushan-era Buddhist stupa about 14 m tall is built atop the highest mound and becomes the future excavation marker.

7. 1922

   Rediscovery

   R. D. Banerji of the ASI rediscovers the 'Mound of the Dead'; large-scale excavations under Marshall begin.

8. 1924

   World debut

   'Illustrated London News' introduces Mohenjo-daro to the world; the existence of the Indus Civilization is established.

9. 1927

   Priest-King unearthed

   The 17.5 cm soapstone 'Priest-King' is found in DK Area, becoming the iconic artifact of the Indus Civilization.

10. 1947

    Partition

    Partition places Mohenjo-daro in Pakistan; finds are split between the two countries' national museums.

11. 1980

    UNESCO inscription

    Inscribed on the World Heritage List under criteria (ii) and (iii), becoming an internationally protected site.

12. 2008-present

    Emergency conservation

    Salt damage and climate-driven brick decay accelerate; UNESCO and conservation bodies maintain emergency response.

Detailed History

Mohenjo-daro was a major city of the Indus (Harappan) Civilization that emerged around 2500 BC on the lower Indus alluvium, with an estimated population of 30,000-40,000 and an area of about 250 hectares. The civilization's roots stretch back through Mehrgarh (7000 BC, Balochistan) and a long agricultural lineage, blossoming as urban civilization around 2600 BC. The city was bipartite: a citadel on the west and a lower city on the east. The citadel held the Great Bath (12 m × 7 m × 2.4 m, with bitumen waterproofing), granary, and assembly hall; the lower city had a strict grid (main streets 10 m wide) and 2-3-storey fired-brick houses. Each house had a well and toilet, and covered public sewers ran beneath, achieving sanitation infrastructure beyond contemporary Egypt and Mesopotamia. Over 2500 seal impressions bear the Indus script of 400-700 signs, undeciphered, with Dravidian and proto-Indo-Aryan hypotheses unresolved. The 'Priest-King' (1927, DK Area, 17.5 cm) and 'Dancing Girl' (1926, HR Area, 10.5 cm bronze) icons emerged from the digs. Decline began around 1900 BC, with the city abandoned by 1500 BC, through climate desiccation, Indus channel shifts, Saraswati disappearance, disease, and the now-discredited Aryan invasion thesis. In the 2nd-5th c. CE, a Kushan-era stupa (about 14 m tall) was built atop the highest mound. R. D. Banerji rediscovered the site in 1922 for the Archaeological Survey of India; Sir John Marshall led 1922-1931 large-scale excavations, and the 1924 'Illustrated London News' presentation established the civilization in the world. Partition (1947) placed it in Pakistan; UNESCO inscribed it in 1980. Since 2008, salt damage and climate-driven brick decay have prompted UNESCO emergency response and ongoing conservation collaboration.

Cultural Significance

Mohenjo-daro is one of two pillars (with Harappa) of the Indus Civilization, central to understanding its urban planning, social organization, and writing system. UNESCO criteria (ii)(iii) cite its masterpiece urban planning and the unique testimony to a vanished civilization. Contemporaneous with Mesopotamia (Ur, Uruk) and Egypt (pyramids), it lacks palaces, royal tombs, and monuments suggesting kingship; the absence of clear elite stratification fuels alternative social models — egalitarian city, theocracy, or merchant republic. The undeciphered Indus script is the world's foremost archaeological mystery; decipherment would rewrite human civilizational history. After Partition (1947), Harappa fell within Pakistan, with finds split between the National Museum of India and the National Museum of Pakistan; the Dancing Girl's ownership remains a long-running issue. Climate-archaeology and ancient-DNA research are advancing the decline question; ancient DNA analysis since the 2010s has clarified Harappan vs. Indo-Aryan genetic divergence, prompting revision of the 'Aryan invasion' thesis. Indo-Pakistani textbooks position the city as a national-identity source, while UNESCO collaboration positions it as a shared heritage.

Architectural Details

Mohenjo-daro covers about 250 hectares (under 10% excavated) and is bipartite: a citadel (about 400 × 200 m) on the west and a lower city on the east. The citadel's highest point holds a Kushan-era Buddhist stupa (about 14 m), with the Great Bath, granary, and assembly hall below. The Great Bath (12 × 7 × 2.4 m) is the world's earliest known public bath, with fired-brick floor and gypsum-mortar plus natural-bitumen waterproofing, and with inflow/outflow channels probably for ritual ablution. The lower city follows a strict grid, with main streets 10 m wide running north-south and east-west, and rectangular blocks. Houses are fired-brick (28 × 14 × 7 cm standard) of 2-3 storeys, each with a well and toilet, and covered public sewers run beneath. The 1:2:4 brick ratio is shared across Indus sites (Harappa, Chanhu-daro, etc.), implying unified measurement and social organization. Finds include over 2500 seals, the 'Priest-King' soapstone statue, the 'Dancing Girl' bronze, animal toys, and child carts. The Indus script of 400-700 signs appears on seals, copper plates, and pottery in short texts (avg. 5-6 signs); the absence of long inscriptions is a major decipherment obstacle.