CBSE Class 6 History: In the Earliest Cities (Harappan Civilization) Study Notes

Nearly 4,700 years ago, some of the world's most sophisticated urban settlements flourished along the Indus River basin. This chapter explores how the Harappan civilization pioneered systematic town planning, advanced sanitation, long-distance trade, and skilled craft production. By examining archaeological evidence from Harappa, Mohenjodaro, Dholavira, and Lothal, we uncover how ancient people organized everyday urban life without modern technology.

The Discovery of Harappa and the Concept of Relative Age

Around 150 years ago, engineers laying railway tracks in Punjab stumbled upon the ruins of Harappa (located in present-day Pakistan). Unaware of the historical value, they extracted thousands of high-quality baked bricks from the old structures to build railway embankments, destroying many original buildings. It was only about 80 years ago that archaeologists realized these ruins belonged to one of the earliest urban civilizations of the subcontinent.

Because Harappa was the first site excavated, all subsequent sites discovered with similar brick architecture, drainage networks, and artifacts were termed the Harappan Civilization or the Indus Valley Civilization. Archaeologists date these cities to approximately 4,700 years ago (roughly 2700 BCE to 1900 BCE).

To understand this chronological scale intuitively, consider that if our present calendar began at Year 0, Harappan urban planning was already thriving more than 2,500 years before that baseline. This makes Harappan urban engineering contemporary with the Old Kingdom Pyramids of Egypt and early Sumerian cities in Mesopotamia.

Masterful City Architecture: Citadel and Lower Town

Most Harappan cities followed a distinct two-part spatial division designed for specific functional and social purposes:

• The Citadel (Western Part): Built on a raised mud-brick platform, this area was smaller in size but higher in elevation. It contained major public structures, administrative buildings, and religious monuments, suggesting it was used by rulers or special gatherings.
• The Lower Town (Eastern Part): This area was much larger in size but located at ground level. It housed the residential quarters, craft workshops, and markets of common citizens.

Surrounding both sections were thick perimeter walls constructed with baked bricks. The Harappans arranged these bricks in an interlocking pattern, ensuring the walls remained structurally stable for thousands of years without collapsing.

At Mohenjodaro, archaeologists uncovered a remarkably engineered water tank known as the Great Bath. Built inside the Citadel, it was lined with bricks, coated with fine plaster, and made completely watertight using a layer of natural tar (bitumen). Steps led down into the tank from two sides, surrounded by changing rooms on all sides. Water was brought in from an adjacent well and drained out through a dedicated outlet after ceremonial bathing.

Sanitary Engineering: Houses, Streets, and Interlocking Drains

Harappan urban engineering was centered around hygiene, structural uniformity, and efficient water management. Houses were typically one or two storeys high, built with thick brick walls around a central open courtyard. Most homes featured a separate bathing area and a private well to ensure a continuous water supply.

The urban layout adhered strictly to a grid pattern, where straight streets intersected at right angles. The drainage network demonstrates the highest level of civil engineering of the Bronze Age:

• Gentle Slopes: Drain channels ran along the streets with calculated gentle gradients, allowing wastewater to flow naturally without stagnation.
• Interconnected Drainage: Domestic drains from private bathrooms and kitchens passed through house walls directly into street sewers.
• Maintenance Access: Street drains were fully covered with stone slabs or bricks, and inspection holes were placed at regular intervals for routine cleaning.

The simultaneous planning of houses, straight thoroughfares, and enclosed drains proves that Harappan municipal authorities implemented centralized planning before construction began.

Social Hierarchy, Craft Specialization, and Raw Material Sourcing

Life in a Harappan city was highly organized, featuring distinct occupational groups:

• Rulers: Planned city layouts, commissioned construction projects, and sent expeditions to distant lands to procure precious metals and stones.
• Scribes: Literate individuals who carved inscriptions onto clay or steatite seals and prepared official documentation on perishable materials that have not survived.
• Craftspersons: Skilled artisans working in home workshops or specialized manufacturing centers to make terracotta toys, spindle whorls for spinning thread, faience ornaments, and bronze tools.

Because the fertile river plains lacked local deposits of metals and precious minerals, the Harappans established extensive procurement networks:

• Copper: Procured from modern-day Rajasthan (Khetri mines) and Oman in West Asia.
• Tin: Sourced from modern-day Afghanistan and Iran, then mixed with copper to manufacture durable bronze.
• Gold: Brought from regions in modern-day Karnataka (South India).
• Precious Stones (Carnelian, Agate, Lapis Lazuli): Imported from Gujarat, Iran, and Afghanistan.

Unique Gujarat Settlements: Dholavira, Lothal, and the Ultimate Decline

Harappan sites in Gujarat display local adaptations to marine geography and trade routes:

• Dholavira (Khadir Beyt in the Rann of Kutch): Unlike standard two-part cities, Dholavira was divided into three distinct fortified parts, each surrounded by massive stone walls with ceremonial gateway entrances. It also contained a vast open stadium for public ceremonies and a famous signboard featuring ten large Indus script characters carved out of white stone inlaid in wood.
• Lothal (Near the Gulf of Khambhat): Situated close to areas rich in semi-precious stones, Lothal functioned as an industrial harbor and manufacturing hub. It possessed a massive brick basin identified as a dockyard where boats entered via a river channel during high tide to load and unload cargo, alongside specialized bead-making workshops and storehouses containing clay sealings.

Around 3,900 years ago (roughly 1900 BCE), the civilization entered a phase of marked decline. City populations dropped, long-distance trade contracted, standard weights and seals were abandoned, and drainage systems broke down. Historians attribute this decline to combined ecological and systemic factors: the drying up of major river systems like the Saraswati, rampant deforestation caused by brick-baking fuel needs, periodic catastrophic flooding, and the collapse of centralized administrative control.

Key takeaways

• Harappan cities flourished approximately 4,700 years ago (~2700 BCE) as the earliest planned urban centers on the Indian subcontinent.
• Cities were typically divided into an elevated, fortified western Citadel for public/administrative use and a broader eastern Lower Town for residential living.
• Harappan drainage systems featured covered, gently sloping street drains with regular inspection holes, connected directly to private home bathrooms.
• Urban society relied on specialized divisions of labor, including rulers, scribes who carved seals, and craftspersons who manufactured bronze tools, beads, and terracotta goods.
• Dholavira was uniquely planned into three fortified sections with large stone inscriptions, while Lothal operated as a coastal port with a brick dockyard and bead-making workshops.
• The civilization declined around 3,900 years ago due to multiple ecological factors, including shifting river courses, deforestation, and the breakdown of municipal authority.

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