Encyclopedia 02: The Indus Valley Civilization — Geography

Category: Geography | Civilization Geography An English-only encyclopedia entry. Chinese annotations are attached via highlights.

1. A River System Without a Single Master River

The Indus Valley Civilization, one of the four great early river-basin cultures of the ancient world, flourished between roughly 2600 and 1900 BCE along the floodplains of the Indus River and its tributaries in what is today Pakistan and northwest India. Unlike Egypt, which clung to the narrow valley of a single great river, the Harappan world was spread across a broad and shifting network of streams, making its geography more diffuse and its boundaries harder to define.

2. Urban Planning on a Grid

Its most remarkable feature was a remarkably uniform system of urban planning. Cities such as Mohenjo-Daro and Harappa were laid out on strict grids, with streets crossing at right angles and a sophisticated network of covered drains running beneath them. This consistency across sites hundreds of kilometres apart suggests a strong central authority capable of enforcing building standards over an enormous territory.

3. The Monsoon and a River That Vanished

The civilisation depended heavily on seasonal monsoon rains, which fed the rivers and made intensive agriculture possible. Yet its geography was also its vulnerability. Tectonic shifts and the gradual drying of the climate altered river courses over centuries. Scholars believe the progressive eastward migration and eventual drying of the Ghaggar-Hakra river system undermined the agricultural base, contributing to the civilisation's slow decline rather than a sudden collapse.

4. Water, Trade and Internal Links

The Indus cities engaged in wide-ranging trade. Seal carvings depicting animals and script, found at distant Mesopotamian sites, attest to a lively maritime exchange across the Arabian Sea. Within the region, a dense network of waterways and overland routes linked the urban cores to rural hinterlands, moving grain, timber and metals.

5. A Script That Still Resists Decoding

A defining mystery of the civilisation is its writing system. Thousands of short inscriptions survive on seals and pottery, but the script remains undeciphered, in part because the texts are too brief. The inability to read the records leaves many questions — about religion, government and language — permanently open, and makes the civilisation uniquely enigmatic among its contemporaries.

Next entry: The Monsoon System (Geography).