The Largest Civilization in the ancient world developed in the Indus Valley of India over 5000 years ago. The Indus was the home to the ancient civilization of Mohenjo-Daro and Harappa. The early cities of India-developed along the Indus river starting around 3500 bce. They are called the Indus Civilization or, sometimes, the Harappan culture. It was the largest and most advanced civilization in the ancient world.
There are 2,600 known Indus sites, from enormous urban cities like Mohenjo Daro and Mehrgarh to small villages like Nausharo. The cities of the Indus Valley Civilization were well- organised and solidly built out of brick and stone. Their drainage systems, wells and water storage systems were the most sophisticated in the ancient world. They also developed systems of weights and trade. They made jewellery and game pieces and toys for their children. From looking at the structures and objects which survive we are able to learn about the people who lived an d worked in these cities so long ago.
But the mighty Indus River Changed its path, and what was once a fertile area became a desert. The people of the region moved to other parts of India and beyond. By 2000 bce the Civilization had entered a period of decline.