On September 20, 1924, John Marshall, then-Director General of the Archaeological Survey of India (ASI), announced the discovery of the “Indus Valley Civilisation” through an article in The Illustrated London News. 

More about the discovery

• This 100 year old announcement came after significant discoveries at the Harappa and Mohenjo-daro sites.
• It marked a monumental moment in the study of South Asian history. 
• The Harappan civilisation flourished  around 2,500 BC (Bronze Age) in western part of South Asia, in contemporary Pakistan and Western India.
• It continues to intrigue scholars for its advanced urban planning, metallurgy, ceramics, water management, and undeciphered script.

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Key Sites and Discoveries 

• Harappa (Pakistan) was first excavated in 1921-22 by Daya Ram Sahni.
• Mohenjo-daro was uncovered by Rakhal Das Banerji in 1922. 
• Both archaeologists unearthed seals, pottery, and metal artifacts, leading to Marshall’s recognition of a civilisation spread across vast distances, including areas now in India, Pakistan, and Afghanistan. 
• With about 2,000 known sites, the civilisation’s major centers include Harappa, Mohenjo-daro, Ganweriwala, Rakhigarhi (India), Surkotada (India), Lothal (India) and Dholavira (India).
• Geographical Extent:
  • Westernmost:Sutkagendor (in Balochistan, Pakistan) 
  • Easternmost: Alamgirpur (Western UP) 
  • Northernmost: Mandu (Jammu) 
  • Southernmost: Daimabad (Ahmednagar, Maharashtra)

Harappan Achievements

• Urban Planning: Grid-pattern streets, water reservoirs, drainage systems, and standardised brick construction.
• Craftsmanship: Bronze and copper artifacts, beads, seals with inscriptions, and intricate terracotta products.
• Advanced Civilization: Standardised weights and measures, use of a script, and maritime contacts with West Asia.

Challenges and Continuing Mysteries

• Undeciphered Script: The Harappan script remains a mystery.
• Reasons for Decline: The reasons behind the decline of the Harappan civilization are unclear.
• Pre-Aryan Origins: Scholars have made significant contributions to understanding the civilization’s pre-Aryan origins.
• Connections to Earlier Cultures: The Harappan civilization’s connections to earlier cultures like Mehrgarh are being explored.

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Decline of Indus Valley Civilisation

• No consensus on causes: The decline of the Indus Valley Civilization remains debated, with multiple theories proposed.
• Environmental change: Gradual climatic shifts may have led to agricultural collapse due to overpopulation and resource exploitation.
• Sudden environmental events: Tectonic activity could have caused floods, dried rivers (like the Sarasvati), or other natural disasters.
• Human intervention: Invasions by hill tribes or Indo-Aryans possibly disrupted trade and weakened cities.
• Epidemic theory: Some suggest an epidemic or similar disaster may have contributed.
• Complex decline: Likely a combination of natural and human factors.

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