The ancient city of Kalibangan reveals the world's earliest evidence of a ploughed field.

Countries & Cities · Published 15 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: Located in Rajasthan, India, this Indus Valley site offers a rare glimpse into urban planning from 2900 BC. Beyond its grid-patterned streets and sophisticated drainage, Kalibangan is famous for its unique fire altars and a mysterious, ancient agricultural layout that mirrors farming techniques still practiced in the region today.

Discovered by Italian Indologist Luigi Tessitori, Kalibangan sits on the banks of the Ghaggar River. Excavations led by the Archaeological Survey of India between 1960 and 1970 revealed a dual-layered history. The lower level, or Period I, dates from 3500 BC to 2500 BC and belongs to the Sothi-Siswal culture. This early phase featured a fortified settlement with mud-brick walls that were significantly thickened during later reconstructions. The site is uniquely distinguished by its fire altars, found in the citadel, private homes, and a separate public area, suggesting a communal ritualistic life that notably lacked evidence of mother goddess worship.

The site’s urban design was remarkably advanced, utilizing a strict grid-iron pattern with streets oriented to cardinal directions. These roads were built in precise mathematical ratios, with widths ranging from 1.8 to 7.2 meters. Houses were constructed with adobe bricks and featured courtyards, wells, and sophisticated drainage systems that emptied into soakage jars. Archaeologists also unearthed the world’s oldest known ploughed field, which displays a grid of furrows spaced 30 and 190 centimeters apart. This layout allowed for the simultaneous cultivation of two different crops, a method that local farmers continue to employ for mustard and gram.

Kalibangan’s history is marked by natural upheaval. Evidence suggests a major earthquake occurred around 2600 BC, which effectively ended the Early Harappan occupation. While the site was later resettled, hydrologist Robert Raikes and archaeologist B. B. Lal proposed that the eventual abandonment of the Mature Harappan city around 2650 BC was caused by the drying up of the Sarasvati River. Today, the site remains a vital reference point for ceramic studies, thanks to the classification of its six distinct pottery fabrics, which help researchers map the cultural evolution of the Indus Valley Civilization.

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