Take the site of Lothal, another key settlement of the Indus Valley Civilization. Not only was Lothal an important trading hub, but it also had an incredibly advanced dockyard for its time.
The Indus Valley Civilization, existing from 3300 BCE to 1300 BCE, is one of the world's earliest urban cultures. Mohenjo Daro, the main city of the Indus Civilization discovered by Sir John Marshall.