Indus Valley | Clues to an Ancient Civilization, National Geographic: The Great Trench | Main City Wall in Ancient Harappa, Pakistan

This “Great Trench” was dug initially by Wheeler in 1946 and identified as the main city wall in ancient Harappa, Pakistan.  Mark Kenoyer redug this site and found the earliest city walls below this point, providing accurate data on the evolution of the city.

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