Lothal circa 2450 BC, bringing with them their tools, technology, crafts, and expanded sea-borne trade. Lothal soon became an industrial center, one of the southernmost outposts of the Indus Valley Civilization, and the most important port of the empire.
Around 2350 BC, after all the houses were destroyed by severe floods, the people of Lothal rallied together, or perhaps were led by someone, to not only rebuild the town, but also to improve on it. They strengthened the walls of the fort, raised the level of the town, built an artificial dock, possibly the first in the world, and an extensive warehouse. A hundred & fifty years later, after the next floods, they again came together to reconstruct the town into a larger city. After the third severe flood circa 2000 BC, many inhabitants left the city to move to higher and safer regions. When the city was again completely submerged around 1900 BC, what is known as the Mature Harappan period gave way to the Late Harappan Period. Poor farmers, artisans, and fishermen gradually returned in hope of rebuilding their lives, but the urban center never regenerated. The populace lived in poorly constructed reed huts, with no drainage, and perhaps even a return to illiteracy. Yet, somehow, the civilization continued here till the 16th century BC, long after it had disappeared from the northern provinces.
Gradually the town was abandoned and silted up over the next few centuries. Dr. Sr. R. Rao’s excavation of the site from 1955-62 provided the most exhaustive study of Harappan culture in India from artifacts and structural remains such as:
Lothal was believed to be Dravidian, but recent findings of association with Vedas and other Sanskrit scriptures lead some to believe this was the cradle of Aryan civilization in the sub-continent. There does seem to be enough evidence to suggest non-Aryan origin, and strong Aryan influence, as well as a meeting of the cultures, both violent and peaceful.