What river was important to the early Indian civilization as the Nile was to Egypt?

Themes; subfields is the answer

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!

Summer months are the wettest.