The relationship between the Early and Mature Harappan phases also becomes clearer when one examines the variation in settlement size, hierarchy, and function across the Indus region. Archaeological evidence shows that Harappan settlements were not uniform urban centres, but ranged from large cities to small villages and pastoral camps, reflecting a complex and differentiated settlement system.
Settlement Hierarchy and Regional Spread
A broad hierarchical pattern can be identified:
| Category | Size | Examples | Characteristics |
|---|
| Large urban centres | 80–200+ ha | Mohenjodaro, Harappa, Rakhigarhi, Dholavira | Administrative, economic, and craft hubs |
| Secondary towns | 10–50 ha | Kalibangan | Regional centres |
| Small towns | 5–10 ha | Lothal, Chanhudaro | Craft specialization |
| Villages | 1–5 ha | Kot Diji, Surkotada | Agrarian base |
This hierarchy indicates a well-integrated economic system, where large urban centres depended on smaller settlements for agricultural surplus, while villages received finished goods and cultural influences from cities. The process of cultural convergence is visible here as even small settlements yielded typical Harappan artefacts such as pottery, beads, and tools.
Regional Variability and Adaptation
Despite cultural uniformity, there was significant regional adaptation:
- In riverine plains, settlements relied on alluvial agriculture
- In semi-arid regions like Kutch and Saurashtra, there was:
- Greater use of stone in construction
- Emphasis on water conservation systems
- Coastal sites like Lothal show maritime orientation and trade specialization
This demonstrates that Harappan urbanism was flexible, adapting to diverse ecological zones while maintaining cultural unity.
Urban Planning and Layout
Although often described as grid-patterned, Harappan cities did not always follow a perfect geometric grid. Instead, they exhibit:
- Planned layouts with variation
- Streets generally oriented north–south and east–west, but:
- Not always straight
- Not always intersecting at right angles
Major Layout Types
- Two-part cities:
- Citadel (elevated, fortified) + Lower town (residential)
- Seen at Mohenjodaro and Harappa
- Integrated layout:
- Citadel within main settlement
- Seen at Lothal and Surkotada
- Three-part division:
- Citadel + Middle town + Lower town
- Unique to Dholavira
This diversity in layout suggests regional planning traditions within an overarching urban framework.
Building Materials and Construction Techniques
A key distinction between urban and rural architecture lies in the choice of materials:
- Villages:
- Predominantly mud-brick
- Use of reeds and mud plaster
- Cities:
- Extensive use of burnt bricks
- Standardized brick sizes:
- Houses: 7 × 14 × 28 cm
- Fortifications: 10 × 20 × 40 cm
- Uniform 1:2:4 ratio, indicating centralized standardization
In regions like Dholavira, the use of dressed stone masonry and massive fortification walls represents a distinct architectural tradition, adapted to local geological conditions.
Brick-laying Techniques
- Use of “English bond style”:
- Alternating stretcher (long side) and header (short side) bricks
- Ensured structural strength and load-bearing capacity
This reflects a high level of engineering knowledge and standardization across regions.
Domestic Architecture and Spatial Organization
Harappan houses exhibit a remarkable degree of uniformity in design principles, though varying in size:
- Layout:
- Rooms arranged around a central courtyard
- Access:
- Doors and windows open into side lanes, not main streets
- Ensures privacy and controlled access
- Vertical expansion:
- Evidence of multi-storey buildings
- Staircases indicate access to upper floors or roofs
Interior Features
- Floors made of:
- Hard-packed earth
- Often plastered or sand-covered
- Roofs:
- Likely made of wooden beams, reeds, and packed clay
- Ventilation:
- Windows with latticework and shutters
Some large houses may have belonged to elite groups, while smaller attached structures could have housed service personnel, suggesting social differentiation within urban space.
Water Management and Sanitation
One of the most distinctive features of Harappan urbanism is its advanced sanitation system, which indicates a high level of civic planning and concern for hygiene.
Bathing Facilities
- Separate bathing areas within houses
- Features:
- Sloped brick platforms
- Waterproof construction
- Located near wells for easy water access
Drainage System
- Small drains from houses:
- Passed through walls into street drains
- Street drains:
- Covered with slabs
- Connected to larger sewage channels
Toilets
- Types:
- Simple cesspits
- Advanced systems with soak jars
- Features:
- Large pots sunk into the floor
- Small hole at base for seepage
- Some connected to external drains
This system implies:
- Regular maintenance
- Possible existence of specialized labour for cleaning and upkeep
The presence of such facilities in many houses across sites like Harappa and Mohenjodaro highlights the standardization of civic amenities across the civilization.
Variation in Planning vs Size
An important observation is that degree of planning does not always correlate with size:
- Smaller site like Lothal:
- Highly planned (dockyard, drainage, industrial zones)
- Larger site like Kalibangan:
- Comparatively less complex planning in some aspects
This suggests that function (trade, industry, administration) influenced planning more than mere size of the settlement.
Evidence of Continuity with Variation
Across all these features—settlement hierarchy, planning, architecture, and sanitation—one observes:
- Strong continuity from Early Harappan foundations
- Increasing standardization and uniformity in Mature phase
- Simultaneous regional adaptations and innovations
This combination of continuity + change reflects a dynamic developmental process, where earlier traditions were refined, expanded, and integrated into a large-scale urban system.
The urban character of Harappan settlements is most clearly reflected in their well laid-out streets, lanes, and highly efficient drainage systems, which together indicate a high degree of civic planning and administrative control. Even relatively small settlements display remarkably sophisticated drainage arrangements, suggesting that such planning was not confined to major urban centres but was a shared cultural trait across the civilization.
Drainage System and Urban Sanitation
A distinguishing feature of Harappan towns was the systematic separation of waste and rainwater channels:
- Sewage drains were distinct from rainwater drains
- Water chutes from upper storeyswere often:
- Built within walls
- Opened just above street-level drains
At sites like Harappa and Mohenjodaro:
- Terracotta pipes carried wastewater from houses
- These connected to open street drains made of baked bricks
- Street drains further linked to:
- Large main drains along major roads
- Which ultimately discharged outside city limits into fields
Structural Features of Drains
- Main drains were:
- Covered with corbelled brick arches or stone slabs
- Rectangular soak pitsplaced at intervals:
- Collected solid waste
- Required regular cleaning and maintenance
This indicates:
- Presence of organized civic authority
- Possible municipal-level supervision
- Awareness of public health and sanitation
Water Supply and Hygiene
The Harappans made elaborate provisions for water, reflecting both practical needs and possible ritual significance.
Sources of Water:
- Rivers
- Wells
- Reservoirs / cisterns
Site-specific Patterns:
- Mohenjodaro:
- Known for numerous wells
- High density → often one well per few houses
- Harappa:
- Fewer wells
- Evidence of a central tank/reservoir
- Dholavira:
- Fewer wells
- Notable for large stone-lined reservoirs
Key Inference:
- Strong emphasis on personal hygiene and water management
- Possible link between bathing and ritual practices
Profiles of Major Harappan Settlements
Only a small proportion of Harappan sites have been excavated, and even within them, partial exposure limits complete understanding. However, available data from major sites provide valuable insights.
Mohenjodaro
Located about 5 km from the Indus River (which may have flowed closer in ancient times), this site represents one of the largest urban centres (approx. 200 ha).
Settlement Layout:
- Two major mounds:
- Western mound (Citadel) – elevated
- Eastern mound (Lower town) – larger, residential
Population Estimate:
- Lower town possibly housed ~40,000+ people (Fairservis)
Citadel Features
- Raised on artificial mud-brick platform
- Surrounded by:
- 6 m thick retaining wall
- Towers and projections
👉 Debate:
- Defensive fortification vs symbolic elevated space
Major Structures on Citadel
1. Great Bath (Most Important)
- Dimensions: 14.5 × 7 m, depth ~2.4 m
- Constructed with:
- Finely fitted bricks
- Gypsum mortar
- Bitumen waterproofing
Features:
- Staircases from north and south
- Sloping floor with drain outlet
- Surrounded by colonnades and rooms
- Nearby well likely supplied water
👉 Significance:
- Advanced hydraulic engineering
- Possible ritual bathing structure
2. “College of Priests” (Tentative Identification)
- Large structure: 69 × 23.4 m
- Includes:
- Courtyard
- Verandahs
- Staircases (multi-storey)
👉 Interpretation uncertain:
- Possibly elite residence / administrative building
3. “Granary” (Debated)
- Size: 50 × 27 m
- Divided into rectangular blocks with passageways
- Features:
- Raised platform
- Nearby well and bathing area
- Possible loading dock (as per Mortimer Wheeler)
❗ Issue:
- No evidence of stored grain
- Function remains uncertain
4. Assembly Hall
- Square structure: 27 × 27 m
- Divided by rows of brick piers
- Possibly used for:
- Gatherings
- Administrative or social functions
Lower Town
- Spread over 80+ hectares
- Divided into blocks by major streets
Street System:
- Main streets: ~9 m wide
- Lanes: 1.5–3 m
Housing Pattern:
- Variation in size → social differentiation
Specialized Areas
- HR Area:
- Large building with seals and statue fragments
- Possibly elite residence / temple-like structure
- Worker/Shop Areas:
- Rows of small houses with bathrooms
- Interpreted as:
Craft Production
Evidence of:
- Copper working
- Bead making
- Pottery production
- Shell working
👉 Indicates:
- Strong craft specialization
- Organized economic activity
Wells and Water Use
- Estimated 700+ wells
- Features:
- Depth: 10–15 m
- Lined with wedge-shaped bricks
- Evidence:
- Rope marks on bricks
- Private + public wells
👉 Social aspect:
- Public wells likely served as community interaction spaces
Chanhudaro
- Small site: ~4.7 ha
- Unfortified settlement
- Located near Indus (closer in ancient times)
Urban Features:
- Mud-brick platforms
- Streets with:
- Covered drains on both sides
Industrial Significance:
- Major craft production centre
- Evidence of:
- Bead factory (steatite beads)
- Semi-precious stones:
- Carnelian, agate, amethyst
- Other crafts:
- Seal making
- Shell working
- Stone weight production
👉 Indicates:
- Specialized industrial town
- Possibly dependent on larger urban centres
Harappa
A major Harappan city covering ~150 hectares, located near the Ravi River.
Layout:
- Citadel (west)
- Lower town (south-east)
- Cemetery (south of citadel)
Citadel Characteristics
- Shape: Parallelogram
- Dimensions:
- Fortified with:
- Mud-brick walls
- Towers and gateways
- Structures built on:
Northern Suburb (Mound F)
- Enclosed area with:
- Workmen’s quarters
- Units arranged in rows:
- Courtyard + room structure
Circular Platforms
- Diameter: ~3 m
- Made of bricks set on edge
👉 Likely used for:
“Granary” at Harappa
- 12 rectangular units:
- Arranged in two rows of six
- Features:
- Central passage
- Air ducts between walls
- Wooden superstructure (probable)
❗ Issue:
- No grain remains found
- Identification based on:
- Analogy with Roman structures
The evidence from these sites highlights the complexity and diversity of Harappan urban centres, where planning, craft production, water management, and social organization were intricately linked, yet expressed differently across regions and settlement types, with each site contributing distinct elements to the broader pattern of Harappan urbanism.
Urban Infrastructure: Drainage & Water Management
- Well-planned streets and lanes were closely integrated with an advanced drainage system
- Separate systemsfor:
- Sewage disposal
- Rainwater collection
- Structural Features of Drainage
- Drains built using baked bricks
- Covered with corbelled arches / stone slabs
- Terracotta pipes used for channeling wastewater
- Soak pits placed at intervals → collected solid waste
- Household Drainage
- Wastewater from houses → street drains → main drains → outside fields
- Upper-storey drains built inside walls
- Maintenance Aspect
- Regular cleaning of soak pits essential
- Indicates existence of organized civic administration
Water Supply & Hygiene
- Sources:
- Rivers
- Wells (private + public)
- Reservoirs / tanks
- Key Observations:
- Mohenjodaro → very high number of wells (~1 per 3 houses)
- Harappa → fewer wells but possible central reservoir
- Dholavira → advanced reservoir-based water management
- Cultural Insight
- Emphasis on bathing → personal hygiene
- Possibly linked to ritual purity / religious practices
Profiles of Major Harappan Sites
Mohenjodaro (Sindh)
General Layout
- Two parts:
- Citadel (west, elevated)
- Lower town (east, extensive area)
- Estimated size: ~200 hectares
- Population estimate: ~40,000+
Citadel Features
- Built on artificial mud-brick platform
- Surrounded by massive retaining walls
Important Structures
- Great Bath
- Size: ~14.5 × 7 m, depth ~2.4 m
- Waterproofing using:
- Gypsum mortar
- Bitumen layer
- Features:
- Staircases (north & south)
- Drainage outlet system
- Indicates:
- Ritual bathing / ceremonial use
- ‘College of Priests’ (Tentative)
- Large multi-room complex with:
- Possibly residence of elite / religious authorities
- ‘Granary’ (Debated)
- Large brick platform divided into blocks
- No direct grain evidence → function uncertain
- Earlier interpreted as:
- Assembly Hall
- Square structure with brick pillars
- Possibly:
Lower Town Features
- Grid-like planning (not perfectly rigid)
- Streets width:
- Main roads: ~9 m
- Lanes: 1.5–3 m
- Housing Variation
- Small → large houses → indicates social differentiation
- Economic Activity
- Workshops:
- Bead making
- Copper working
- Pottery
- Shell industry
- Water System
- ~700 wells
- Both private and public wells
Chanhudaro (Sindh)
- Size: ~4.7 hectares
- Unfortified settlement
Key Features
- Major craft production centre
- Industries:
- Bead factory (steatite)
- Seal making
- Shell working
- Stone weights
- Evidence:
- Raw materials + finished goods → industrial specialization
Harappa (Punjab, Pakistan)
- Area: ~150 hectares
- Divided into:
- Citadel (west)
- Lower town (south-east)
Citadel Characteristics
- Fortified with:
- Mud-brick walls
- Towers and gateways
- Structures built on elevated platforms
Mound F (Northern Sector)
- Interpreted as craft / industrial suburb
Key Findings
- Workmen quarters:
- Rows of units with courtyard + room
- Circular brick platforms:
- Possibly threshing floors
- Nearby structure:
- Identified as granary (debated)
Lower Town (Mound E)
Key Features
- Large open space near gate:
- Possibly market / inspection zone
- Workshops:
- Outside gate:
- Houses + drains → resting place for traders
Kalibangan (Rajasthan)
- Located on Ghaggar river bed
- Two main mounds:
- KLB-1 (citadel)
- KLB-2 (lower town)
Citadel Features
- Divided into two sectors
- Southern sector:
- No houses
- Fire altars (ritual pits)
- Northern sector:
- Burial ground nearby:
- Includes:
- Pit burials
- Symbolic burials (no skeletons)
Lower Town
- Fortified parallelogram layout
- Houses contain:
- Fire altars
- Ritual installations
- Drainage:
- No large street drains
- Waste → jars / troughs outside houses
Craft Activity
- Bangle production (major)
- Materials:
- Terracotta
- Shell
- Faience
- Steatite
Banawali (Haryana)
- Fortified settlement: 300 × 500 m
- Divided into:
- Citadel (semi-elliptical)
- Lower town
Key Features
- Houses:
- Mud-brick
- Raised platforms (chabutaras)
- Evidence of:
- Merchant house (seals + weights)
- Jeweller’s house (gold, beads, touchstone)
- Artefacts:
- Terracotta plough
- Numerous weights
- Fire altars present → ritual significance
Rakhigarhi (Haryana)
- One of the largest Harappan sites
- Composed of multiple mounds
Key Findings
- Lapidary workshop
- Bone & ivory industry
- Cemetery:
- Brick-lined graves
- Wooden coffin (rare)
Bhirrana (Haryana)
Urban Features
- Multi-room houses:
- Courtyard + verandah + kitchen
- Streets:
- Main street (~4.8 m wide)
- Lanes
- Domestic features:
- Chullah, tandoor
- Animal remains → dietary evidence
Lothal (Gujarat)
- Located near Sabarmati–Bhogavo system
- Rectangular settlement: 280 × 225 m
Urban Layout
- Citadel (Acropolis) + Lower town
- Warehouse near residential area
Economic Features
- Industrial houses:
- Bazaar street → commercial zone
Dockyard (Most Important)
- Trapezoidal basin:
- Features:
- Sluice gate system
- Water level control
- Function:
Dholavira (Kutch, Gujarat)
Unique Urban Layout
- Multi-tiered division:
- Castle
- Bailey
- Middle town
- Lower town
- Strong fortification walls with stone veneer
Special Features
- Large open area:
- ‘Stadium’ → ceremonial use
- Extensive settlement outside walls → suburbs
- Strategic importance:
- Linked to maritime trade routes
Dholavira (Continued: Acropolis, Signboard & Water System)
- Fortified Acropolis
- Size: 300 × 300 m
- Gateways at centre of all four walls
- Discovery:
- Limestone pillar bases + polished stone fragments
- Significance:
- Pushes origin of monumental stone architecture back to 3rd millennium BCE (earlier than Mauryan period)
- Dholavira Signboard
- Found in northern gateway side room
- Features:
- Symbols made with white gypsum inlay
- Originally fixed on wooden board (decayed)
- Each sign ~ 37 × 25–27 cm
- Interpretation:
- Possibly city name / ruler’s title
- One of the largest Harappan inscriptions
- Acropolis Infrastructure
- Large well
- Advanced drainage system
- Large buildings:
- Likely administrative / ritual functions
Town Planning at Dholavira
| Section | Features |
|---|
| Middle Town | Fortified (360 × 250 m), 4 gateways |
| Lower Town | Residential + craft activity zones |
| Outside Walls | Habitation + burial areas |
Burial Practices (Dholavira)
- Rectangular stone-lined pits
- Absence of skeletons → interpreted as:
- Memorial burials / cenotaphs
Water Harvesting System (Dholavira – Most Advanced Feature)
- Region: Low rainfall (<160 cm), drought-prone
- Natural setting:
- Between Manhar and Mandsar streams
- Key Techniques:
- Dams constructed across streams
- Water diverted into reservoirs
- Storage System:
- At least 16 reservoirs / cisterns
- Located in:
- Significance:
- One of the most sophisticated water management systems in ancient world
- Adaptation to arid ecology
Allahdino (Sindh)
- Small site: ~1.4 hectares
- Unfortified village settlement
Settlement Features
- Houses:
- Mud-brick
- Stone foundations
- Orientation:
- Special Structures:
- Large multi-roomed building → elite/administrative
- Building with three wells
Unique Well Design
- Small diameter:
- Purpose:
- Increase hydraulic pressure
- Possible use:
Material Culture
- Artefacts:
- Copper objects
- Seals
- Terracotta toy carts
- Terracotta cakes
- Exceptional Discovery
- Terracotta jar containing:
- Gold, silver, bronze ornaments
- Carnelian, agate beads
- Notable items:
- 36-bead carnelian belt/necklace
- Multi-strand silver necklace
- Interpretation:
- Presence of wealthy elite even in villages
Harappan Subsistence & Economy
Geographical Spread & Resource Base
- Covered diverse regions:
- Alluvial plains
- Mountains
- Plateaux
- Coastal zones
- Implications:
- Strong resource base
- Enabled:
Economic Base
- Primary:
- Supplementary:
- Animal husbandry
- Hunting
- Fishing (riverine + marine)
Sources of Evidence
- Plant remains
- Animal bones
- Artefacts
- Seal motifs
- Ethnographic parallels
Debate on Harappan Climate
Theory: Wetter Climate (Wheeler, Piggott)
Arguments:
- Large number of burnt bricks → need for forests
- Gabarbands (embankments) in Baluchistan
- Depiction of:
- Tiger, elephant, rhinoceros
- Advanced drainage system
Criticism of This Theory
- Brick production ≠ necessarily dense forests
- Drainage system mainly for:
- Sewage disposal, not rainwater
Alternative View
- Climate similar to present conditions
Scientific Evidence (Pollen Studies)
- Gurdip Singh (1971):
- Increase in rainfall → c. 3000 BCE
- Decrease → c. 1800 BCE
- Later Study (Enzel et al., 1999):
- Dry conditions began before Harappan phase (~3500 BCE)
- Conclusion:
- Climate debate remains unresolved
Agriculture & Crops
Major Crops by Site
- Wheat → Mohenjodaro, Harappa
- Barley → Mohenjodaro, Harappa, Kalibangan
- Sesamum → Harappa
- Rice → Harappa, Kalibangan, Lothal, Rangpur
- Millets → Harappa, Surkotada, Shortugai
Other Crops & Plants
- Pulses:
- Peas, chickpea, green gram, horse gram
- Fruits:
- Watermelon, dates, grapes
- Cash crop:
- Others:
- Henna (mehendi)
- Garlic (earliest evidence)
Balu (Haryana) – Important Site
- Provides detailed plant economy evidence
Crops Identified
- Cereals:
- Pulses:
- Oilseeds:
- Fruits & vegetables:
- Melon, watermelon, grapes, dates
Key Observations
- Highly diversified agriculture
- Combination of:
- Cereals + pulses + fruits
- Regional adaptability
- Strong continuity between:
- Ancient and modern cropping patterns