Trade was very important for the Indus civilisation ... We know that only the cities fell into ruins. Farmers in the Indus Valley went on living in their villages and working on their farms ...

In the Arabian Peninsula a mere 2000 km away, out of sight of the Indus, the Sumerian civilization ... Valley seals in Egyptian tombs, point to a trade and exchange of ideas. The sea routes ...

with evidence suggesting trade links with Mesopotamia, Persia, and other distant regions. Decline and Abandonment: Despite its success, the Indus Valley Civilization began to decline around 1900 BCE.