Mohenjo-daro

1. Location, discovery and historical significance

Mohenjo-daro developed in the alluvial environment of the lower Indus basin. The river system supported agriculture, transport and access to wider exchange networks, but also exposed settlements to flooding and shifting channels. Its location should be distinguished from Harappa, which lies in Punjab, Pakistan, near an old course of the Ravi. Both sites gave early archaeologists decisive evidence of an extensive urban civilization that flourished alongside Bronze Age Egypt and Mesopotamia.

Rakhal Das Banerji investigated Mohenjo-daro in 1922 while working for the Archaeological Survey of India. His discoveries followed Daya Ram Sahni's excavations at Harappa in 1921. John Marshall announced the recognition of the Indus Civilization in 1924. Subsequent excavations associated with Marshall, Ernest Mackay and Mortimer Wheeler revealed major buildings, residential quarters and artefacts. These discoveries fundamentally revised the understanding of early urbanism in South Asia.

The best-known remains belong to the Mature Harappan period, approximately 2600–1900 BCE. Excavation has not exposed the entire settlement, and groundwater restricts investigation of deeper deposits. Consequently, the visible ruins provide an incomplete picture of the city's development. Its ancient name, spoken language and precise political status remain unknown because the Indus script has not been securely deciphered.

• Map linkage: Mohenjo-daro—Sindh—lower Indus; Harappa—Punjab—Ravi region.
• Do not confuse archaeological discovery in the twentieth century with the settlement's Bronze Age occupation.

2. Urban layout, houses and civic infrastructure

Mohenjo-daro is conventionally described as comprising an elevated western mound, often called the citadel, and an extensive lower town to the east. The term citadel describes an archaeological feature and does not establish the existence of a royal fortress. Raised platforms and substantial construction may have served several purposes, including elevation above flood-prone surroundings. Streets broadly followed a planned arrangement, with major routes intersecting approximately at right angles; however, the city was not a perfectly uniform grid.

Baked bricks were widely used, especially where structures faced water exposure, while mud bricks were also employed. Many Harappan bricks followed a thickness-width-length ratio of approximately 1:2:4. Houses commonly contained rooms around a courtyard, and entrances often opened onto smaller lanes. Some buildings had staircases indicating access to roofs or upper storeys. Differences in house size and amenities suggest social differentiation, although they do not reveal a clearly identifiable class of kings.

Numerous wells supplied water, and bathing platforms drained through outlets into street drainage systems. Covered drains, settling arrangements and access points for cleaning indicate careful attention to wastewater management. These features demonstrate coordinated construction and maintenance, but they should not be equated with modern universal sanitation. Infrastructure varied between buildings and neighbourhoods, and drainage evidence cannot establish that every resident enjoyed identical living conditions.

• Planning, brick standardisation and drainage suggest organised civic activity; they do not by themselves prove a centralised monarchy.
• Household bathing facilities are distinct from the monumental Great Bath.

3. The Great Bath and major architectural interpretations

The Great Bath is Mohenjo-daro's most distinctive public structure. Its central tank measures approximately 12 metres by 7 metres and about 2.4 metres deep. Flights of steps descend into it from opposite ends. Carefully laid baked bricks, gypsum mortar and a layer of bitumen helped make the tank watertight. Surrounding rooms, a nearby well and a drainage arrangement formed part of the complex.

The scale and specialised construction suggest an activity of collective significance. Ritual bathing is a widely accepted interpretation, but it remains an inference rather than a fact established by deciphered texts. The Great Bath should not be described as a temple, a royal swimming pool or proof of a particular later religious tradition. Its importance lies in showing that substantial resources were devoted to a shared water-related facility.

Other excavated structures have received labels such as 'Great Granary' and 'Assembly Hall'. These names are useful for identifying conventional archaeological descriptions, but their functions are debated. In particular, the granary interpretation lacks decisive evidence of grain storage. No building has been universally accepted as a royal palace or monumental temple. This contrasts with the readily identifiable palaces, royal tombs and temples of some contemporary civilizations, without proving the absence of rulers or religious institutions.

• Exam-safe distinction: the tank's construction is observable evidence; its ritual purpose is interpretation.
• Treat 'granary', 'assembly hall' and 'citadel' as conventional labels rather than unquestionable functional identifications.

4. Crafts, exchange, society and symbolic life

Mohenjo-daro yielded evidence of specialised production and exchange: beads, shell objects, pottery, faience, copper and bronze objects, seals and standardised weights. Its population depended on agricultural supplies and connections with other settlements. Wheat and barley were important crops within the wider Harappan economy, while cotton is attested in Harappan material evidence. Exchange brought materials from distant source regions, including stones and metals unavailable in the immediate alluvial surroundings.

The small bronze figurine conventionally called the 'Dancing Girl' illustrates accomplished metalworking using the lost-wax technique. Its bangles and confident stance are observable features; the identification of the figure as a dancer is interpretive. The bearded stone figure called the 'Priest-King' wears a decorated garment, but neither priestly nor royal status has been demonstrated. Both names are modern labels, not titles preserved in Harappan records.

Steatite seals commonly display animal motifs and short inscriptions. They probably participated in identification, administration or exchange, although their complete functions remain uncertain. A famous seal showing a seated, horned figure surrounded by animals is often called the 'Pashupati seal'. Its identification with Shiva or a fully developed yogic tradition is debated. Likewise, female terracotta figurines do not automatically establish a universal mother-goddess cult. Since the script is undeciphered, claims about named deities, dynasties or a definite administrative system exceed the evidence.

• Harappan contacts with Mesopotamia are supported by wider archaeological and textual evidence; Mesopotamian 'Meluhha' is generally associated with the Indus region.
• Standardised weights indicate shared measurement practices, not necessarily a single empire ruling all Harappan settlements.

5. Urban decline, conservation and examination relevance

Mohenjo-daro's urban organisation weakened towards the end of the Mature Harappan phase. Rebuilding, modifications to structures and changes in settlement conditions indicate a complex history rather than one securely identified destruction event. Flooding affected the city, but repeated floods alone cannot explain the transformation of the entire Harappan world. Environmental change, altered river behaviour, economic disruption and regional shifts in settlement must be assessed at appropriate geographical scales.

The older claim that invading Aryans massacred the city's inhabitants is not supported by the excavated skeletal evidence. Human remains found in different contexts do not establish a single city-wide massacre. Harappan de-urbanisation was regionally varied and involved the continuation and transformation of many cultural practices. It should therefore be distinguished from the sudden disappearance of an entire population.

Today, salt crystallisation, moisture movement, erosion and extreme weather threaten the exposed brick remains. Conservation requires drainage management, monitoring and careful protection rather than indiscriminate reconstruction. UNESCO recognition underlines the site's outstanding significance as evidence of early planned urbanism. For UPSC, Mohenjo-daro is best studied through site-feature matching, map location, craft techniques and the distinction between material evidence and historical inference.

• Avoid transferring Dholavira's major reservoir system or Lothal's conventionally identified dockyard to Mohenjo-daro.
• A balanced answer combines urban achievements with uncertainty about political authority, religious identity and causes of decline.

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