Answer:
The area had fertile flood plains
Step-by-step explanation:
The Indus river valley is part of these countries in modern times known as Pakistan and northwest India. the migration of the ARYAN PEOPLE started from Indus river valley because the area was a fertile plain connecting to the near east.
The Aryan people where cattle rearing people and farmers and the needed fertile plains to practice agriculture and also get good grass and water for their cattle hence the civilization/migration started from the Indus river valley for the Aryan people before getting into India