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Epigraphists have noted that over 75% of these graffiti marks bear a structural and stylistic resemblance to the still-undeciphered Indus Script symbols.

The central tool for Balakrishnan’s exploration is the ancient Sangam Tamil corpus. Traditionally dated to the early centuries of the Common Era, the Sangam poems are a magnificent collection of love and war, but they are also far more. They function as a vast encyclopaedia, depicting a rich, urban, and highly material culture. The key insight Balakrishnan highlights is that this literature is filled with references to geographical features that simply do not exist in the South India where it was compiled: detailed descriptions of the Himalayas, the north-western winds and landscapes, and even creatures like the lion and the bone-eating camel.

Historically, the Sangam landscape of Tamil Nadu was viewed as a later development, dating back to roughly 300 BCE. The discovery of Keezhadi, an archaeological site near Madurai along the Vaigai River, completely transformed this timeline.

The validation of the Indus-Vaigai connection fundamentally reshapes Indian history in several ways:

As the civilization flourished, people began to migrate to other parts of the Indian subcontinent in search of new lands, resources, and opportunities. One such group of migrants traveled southeast, following the course of the Indus River and its tributaries.

Houses possessed private bathrooms connected to a sophisticated, covered street drainage system.

For history enthusiasts and students of Indian heritage, understanding this trajectory is essential. It is the story of how the subcontinent evolved from the meticulously planned cities of Harappa and Mohenjo-Daro to the bustling, trade-rich ports of the Sangam Age in the South.

Around 1900 BCE, a combination of climate change, drying rivers (such as the Ghaggar-Hakra), and shifting monsoon patterns led to the gradual de-urbanization of the Indus cities. The population began moving eastward and southward, carrying their cultural memory with them. 2. The Vaigai River Valley and the Keezhadi Revelations

Carbon dating of artifacts from Keezhadi has pushed the timeline of the Sangam era back to the 6th century BCE (around 580 BCE). This aligns the timeline of the Vaigai civilization perfectly with the late-migratory phases of post-Indus societies.

For the traveler or the armchair historian, this journey changes how you look at India. The Indus gives you grand baths and squares; the Vaigai gives you the Sangam poetry and the meen (fish) symbol. One is the civilization of the granary; the other is the civilization of the akam (inner self).

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