One of the world's earliest urban civilisations — its sites, town planning, economy, and the debate over its decline.
The Indus Valley Civilisation (IVC), also called the Harappan Civilisation after its first excavated site, was one of the world's earliest urban civilisations, flourishing roughly between 3300 BCE and 1300 BCE, with its mature phase between 2600 BCE and 1900 BCE. It spread across present-day Pakistan and northwest India, covering an area far larger than contemporary Egyptian or Mesopotamian civilisations — making it one of the most geographically extensive Bronze Age cultures.
Discovered in the 1920s through excavations at Harappa and Mohenjo-daro, the IVC is a recurring topic across UPSC, APPSC, and TSPSC prelims and mains, both as static history and through its recurring linkages to art & culture, urban planning, and trade.
The Harappans are best known for their remarkably advanced town planning, which appears strikingly uniform across widely separated sites:
The Harappan economy was based on agriculture, craft specialisation, and long-distance trade. Wheat and barley were the staple crops; cotton cultivation is among the earliest known anywhere in the world. Evidence of trade with Mesopotamia (referred to as "Meluhha" in Sumerian texts) comes from Harappan seals found at Mesopotamian sites. The civilisation used standardised weights (based on a binary system: 1, 2, 4, 8...) and measures, indicating regulated trade practices.
The Harappan script remains undeciphered to date, despite being found on thousands of seals — this is a frequently tested fact. Religious practices are inferred largely from artefacts: worship of a Mother Goddess, a seal depicting a figure often identified as a "Proto-Shiva" (Pashupati seal), and reverence for animals (bull) and possibly trees. Terracotta figurines, seals depicting the unicorn, and the absence of large temple structures (unlike Mesopotamia) suggest a distinct religious character.
Society appears to have been relatively egalitarian in comparison to contemporaneous civilisations — the near-absence of grand palaces or elaborate royal tombs is notable, though the exact nature of Harappan political organisation remains debated among historians.
The decline of the IVC around 1900 BCE is attributed to multiple, possibly overlapping, factors rather than a single cause:
The once-favoured "Aryan invasion" theory as a cause of collapse has been largely set aside by mainstream historians in favour of these environmental and economic explanations, though this remains a topic of ongoing academic and, at times, political debate.
Harappan seals, mostly made of steatite, are among the most iconic artefacts of the civilisation — over 2,000 have been found, most bearing an animal motif (the unicorn bull is the most common) along with undeciphered script. These seals likely served as marks of ownership or trade identification, and their consistent style across distant sites is further evidence of cultural and administrative uniformity. Terracotta figurines, bronze castings using the lost-wax technique (the famous "Dancing Girl" from Mohenjo-daro is the best-known example), and bead-making using semi-precious stones like carnelian point to a sophisticated craft economy. Pottery was typically wheel-made, painted in black over a red background with geometric and plant motifs.
For Prelims, this topic is tested mainly through site-identification questions (which site is on which river, in which present-day state) and factual specifics (script status, brick ratio, absence of temples). For Mains, especially GS Paper I, questions typically ask you to compare Harappan urban planning with later Indian urbanisation, or to evaluate competing theories of decline — answers that cite specific sites (Dholavira's water management, Lothal's dockyard) tend to score better than generic descriptions. It is also a useful anchor topic to connect with Art & Culture questions on the Pashupati seal and terracotta art.
