This photograph is an example of developed drainage in Indus Valley civilization.
Ancient Indians are also credited with the invention of Docks for ships and boats. This was a remarkable achievement by all standards. The world’s oldest dock is in the city of Lothal in the city of Gujarat, India.
The ancient civilizations were not at all isolated and confined. Seals with writing from the Harappan civilization have been found in the Sumerian region, suggesting a well defined network of trade through land and sea.