The Indus Valley Civilization: the Forgotten Giant of the Ancient World

Introduction

Of the world's earliest and greatest civilizations, none is more enigmatic, more sophisticated, and more persistently mysterious than the Indus Valley Civilization. Known also as the Harappan Civilization after Harappa, the first of its great cities to be excavated in modern times, this Bronze Age culture flourished in the river valleys and coastal lowlands of what is now Pakistan, northwestern India, and eastern Afghanistan for well over a thousand years. At its height, roughly between 2600 and 1900 BC, it was the largest civilization on earth by geographic extent, sprawling across approximately 1.3 million square kilometers and encompassing more cities and towns than ancient Egypt and Mesopotamia combined. It built planned urban centers with straight streets, multilevel buildings, indoor plumbing, and public drainage systems that would not be surpassed anywhere in the world for thousands of years. Its merchants sent goods to the Persian Gulf, to Mesopotamia, and perhaps beyond. Its craftsmen worked in copper, bronze, gold, ivory, shell, and precious stone with extraordinary skill. Its people developed a writing system that remains, after nearly a century of determined scholarly effort, completely undeciphered.

And yet, despite all of this, the Indus Valley Civilization remains the least understood of the three great civilizations of the ancient world. We know the names of the pharaohs of Egypt. We have read the business contracts and love songs of ancient Sumer. We can trace the rise and fall of Mesopotamian empires across millennia of written records. But the people of the Indus Valley have left us their cities, their artifacts, and their seals inscribed with a mysterious script, and nothing more. We do not know what they called themselves, what language they spoke, what gods they worshipped, who governed them, or why, after more than a thousand years of remarkable stability, their civilization dissolved and was forgotten so thoroughly that even their brick-built cities were quarried for railroad ballast in the nineteenth century before anyone understood what they were.

This article traces the full arc of the Indus Valley Civilization: its discovery and rediscovery, its geography and cities, its extraordinary urban planning and technology, its economy and trade networks, its art and religion, the enduring mystery of its script, the debate over its social and political organization, the theories surrounding its decline, and the questions about its legacy in the cultures of South Asia that came after it.

The Rediscovery of a Lost World

The story of the Indus Valley Civilization's rediscovery is one of the more extraordinary accidents in the history of archaeology. For more than three thousand years, the cities of the Harappan world lay buried under silt and sand, unknown even to the people who lived nearby. Ancient Indian texts, including the Vedas and later epics, make no clear reference to these cities. Medieval travelers passed through the region without any knowledge of what lay beneath their feet. The landscape gave nothing away.

The first hint came not from scholars but from laborers. In the 1850s, British engineers engaged in the construction of the East Indian Railway, which would run between Karachi and Lahore, were in need of ballast for the tracks. Local contractors discovered an almost inexhaustible supply of baked bricks near a mound that locals called Harappa, in what is now Pakistan's Punjab province. These bricks were ancient, thousands of years old, yet they were so well fired and so precisely made that they were still structurally sound. By some estimates, tens of millions of these Harappan bricks were used as railway ballast between the 1850s and the 1870s. In doing so, the railway builders unknowingly quarried and destroyed a substantial portion of one of the world's most important archaeological sites, grinding three-thousand-year-old urban infrastructure into rubble beneath the rails of empire.