Indus Valley Civilization

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Indus Valley Civilization — Key Facts for TNPSC Group 1 Core concept: The Indus Valley Civilization (c. 3300–1300 BCE) was one of the world’s earliest urban settlements, contemporaneous with ancient Mesopotamia and Egypt High-yield point: Major cities — Harappa and Mohenjo-daro — demonstrate advanced town planning with brick-lined drainage systems ⚡ Exam tip: Questions from Indus Valley Civilization appear regularly in TNPSC Group 1; focus on unique features like the Great Bath, granaries, and script

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Indus Valley Civilization — TNPSC Group 1 Study Guide

Overview

The Indus Valley Civilization (also called the Harappan Civilization) flourished in the northwestern regions of the Indian subcontinent — modern-day Pakistan and northwest India — from approximately 3300 BCE to 1300 BCE. It is one of the earliest and largest urban civilizations in the ancient world, spanning an area larger than either contemporary Mesopotamia or Egypt. At its peak, the civilization encompassed over 1 million square kilometers.

Major Cities

Harappa: Discovered in 1921 by Sir John Marshall, Harappa was located on the banks of the Ravi River in present-day Punjab, Pakistan. It was the first site to give its name to this civilization. The city was characterized by its standardized brick sizes (ratio 1:2:4), uniform weights and measures, and distinctive red-brownware pottery.

Mohenjo-daro: Discovered in 1922 by R.D. Banerji, this “Mound of the Dead” city was located in present-day Sindh, Pakistan. It is considered the most well-planned city of the ancient world with remarkable drainage systems. Its most famous structure is the Great Bath, a large tank 12 meters long, 7 meters wide, and 3 meters deep, likely used for ritual bathing.

Dholavira: Located in Gujarat, India, Dholavira is one of the largest Harappan sites and showcases unique features like the use of semi-precious stones and the famous “Dholavira signboard” with the earliest known letters of the Indus script.

Lothal: Located in Gujarat, India, Lothal was a major port city and is famous for its dockyard — the world’s earliest known dock. It was a center of maritime trade and is associated with the world’s first known furnace for bead-making.

Town Planning

The Harappan cities displayed remarkable urban planning:

• Grid pattern: Streets and lanes intersected at right angles, dividing the city into rectangular blocks
• Drainage system: Every house was connected to covered drainage channels running along the streets — a hallmark of civic sanitation
• Standardized bricks: Uniform dimensions across all Harappan sites suggest centralized authority
• Citadel and lower town: Cities were divided into an elevated citadel (likely administrative/religious center) and a larger lower town (residential)
• Storehouses/Granaries: Large mud-brick structures near the citadel suggest centralized grain storage and distribution

Economy and Trade

The Harappans engaged in both domestic and international trade:

• Domestic trade: Agricultural surplus (wheat, barley, cotton) and craft production (bead-making, pottery, metalwork)
• International trade: Established trade links with Mesopotamia (cuneiform tablets mention “Meluhha” — likely the Indus region), Oman, and the Persian Gulf region
• Exports: Carnelian beads, cotton textiles, terracotta figurines, gold, copper, and ivory
• Imports: Lapis lazuli (from Afghanistan), copper (from Rajasthan), tin, andbitumen

Script and Language

The Indus script remains undeciphered — one of the major unsolved puzzles of archaeology. The script consists of approximately 400 signs and was written from right to left. Seals with script impressions have been found at all major Harappan sites.

Art and Artifacts

• Terracotta figurines: The most famous is the “Dancing Girl” from Mohenjo-daro — a bronze statue showing a confident, adorned female figure
• Seals: Square or rectangular steatite seals depicting a mythical “unicorn” and a deity resembling Shiva (Proto-Shiva or Pashupati)
• Pottery: Mass-produced on a wheel, featuring geometric patterns and painted designs
• Jewellery: Beads made of carnelian, jasper, crystal, gold, and terracotta

Decline of the Civilization

The decline around 1900–1300 BCE is attributed to multiple factors:

• Climate change: Aridification and weakening of the monsoon
• Geological factors: Flooding or river course changes
• Ecological degradation: Deforestation and soil exhaustion from intensive agriculture
• External migration: Possible migration of Aryan tribes (though this remains debated)

⚠️ Common mistakes: Do not confuse the decline with the Aryan migration theory — TNPSC often tests this distinction. The “Aryan Invasion Theory” is contested; most scholars now prefer “Indo-Aryan migration” or cultural interaction models.

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Indus Valley Civilization — Comprehensive TNPSC Group 1 Notes

Geographical Extent

The Harappan civilization extended over a vast area:

• West: Near the Arabian Sea coast (Sutkagen Dor in Balochistan)
• East: Near the Ganges-Yamuna doab (Alamgirpur in Uttar Pradesh)
• North: Near the Himalayas (Kashmir regions — Burzahom)
• South: Narmada estuary (Rakhigarhi in Haryana is now recognized as a major site)

Sites discovered include: Harappa, Mohenjo-daro, Dholavira, Lothal, Rakhigarhi, Ganweriwala, Chanhudaro, Kot Diji, Kalibangan, Banawali, and over 1,000 other sites.

Chronology

Phase	Period	Key Features
Early Harappan	3300–2600 BCE	Pre-urban phase, villages, simple pottery
Mature Harappan	2600–1900 BCE	Full urbanization, standardized bricks, drainage
Late Harappan	1900–1300 BCE	Declining trade, smaller settlements, migrations

Religious Practices

• Proto-Shiva (Pashupati): A seal from Mohenjo-daro depicts a seated figure in a yogic posture surrounded by animals — identified as a precursor to Lord Shiva
• Mother Goddess worship: Terracotta figurines of a female deity (emphasized body features) suggest fertility goddess worship
• Sacred animals: The unicorn motif on seals and the practice of animal worship foreshadow later Hindu traditions
• Tree worship: Pipal tree motifs and the prevalence of sacred fig trees connect to later Indic traditions

Agricultural Practices

The Harappans cultivated:

• Wheat: Two varieties — emmer wheat and durum wheat
• Barley: The most common crop
• Cotton: Evidence of cotton cultivation dates to around 5000 BCE — possibly the earliest in the world
• Sesame, peas, lentils, chickpeas, and linseed

They practiced both rain-fed and irrigated agriculture using canal systems.

Technical Achievements

• Metallurgy: Knowledge of copper, bronze, and tin (though bronze tools were less common than in Mesopotamia)
• Bead-making: World-class expertise in drilling and polishing carnelian beads; Lothal had dedicated bead factories
• Weight and measures: Binary weight system (1, 2, 4, 8, 16…) found across all Harappan sites — suggesting standardized trade practices
• Town planning: The drainage system of Mohenjo-daro was so advanced that some sections are still functional today

Key Differences from Contemporary Civilizations

Feature	Harappa	Mesopotamia	Egypt
Writing	Undeciphered script	Cuneiform (deciphered)	Hieroglyphics (deciphered)
Rulers	No clear evidence of kings	Clear monarchic rule	Pharaohs as god-kings
Religion	Proto-Shiva, Mother Goddess	Marduk, Ishtar	Ra, Osiris
Architecture	Uniform grid pattern	Ziggurats	Pyramids
Trade	Maritime + overland	Overland + riverine	Mediterranean maritime

Archaeological Excavations and Key Archaeologists

• Sir John Marshall: Director-General of ASI when Harappa was excavated; published major work on the civilization
• R.D. Banerji: Discovered Mohenjo-daro
• Mohan Singh: Found Lothal
• B.B. Lal: Conducted excavations at Kalibangan and later at Ayodhya; championed indigenous development model
• S.R. Rao: Major excavations at Dholavira

Theories of Decline

1. Aryan Invasion Theory (contested): Suggested by British archaeologists — now largely rejected in favor of migration/infiltration models
2. Climate Change Theory: Aridification supported by paleoclimate data; monsoon weakening
3. Ecological Crisis: Deforestation, overgrazing, soil exhaustion
4. Flooding Theory: River Indus and Ghaggar-Hakra changed course, devastating settlements
5. Indigenous Decline Model: Internal social/economic factors without external invasion

TNPSC-Specific High-Yield Points

• The Great Bath at Mohenjo-daro is the most frequently asked about structure
• Undeciphered script is a key point — TNPSC often asks why it remains undeciphered
• Lothal dockyard — the world’s oldest known dock
• Dholavira — newest major discovery; found in Gujarat
• Indus script signs: Approximately 400-600 signs
• Standardized weights suggest regulated commerce
• The civilization was contemporary with Mesopotamia — know this for world history comparisons
• No evidence of monuments to rulers — egalitarian society theory

Practice Questions (Previous Year TNPSC Patterns)

1. The most well-planned city of the Indus Valley Civilization was: a) Harappa b) Mohenjo-daro c) Lothal d) Dholavira

2. The world’s oldest dockyard was found at: a) Harappa b) Lothal c) Dholavira d) Chanhudaro

3. The decipherment of the Indus script is a major challenge because: a) Scripts are too ancient b) Bilingual inscriptions are absent c) Signs are too complex d) Language is unknown

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