Question

An important city of the ganga valley

Answer 1

hlo dear
Haridwar, Kanpur, Jajmau, Allahabad, Varanasi, Mirzapur, Ghazipur, Patna, Rishikesh, Munger, Bhagalpur, Baharampur, Kolkata, Bijnor

These are the cities in Ganga Valley... If you are looking for one important place, then I think it may be Kolkata..
hope it helped
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Answer 2

Originating in the Himalayas and draining in the Bay of Bengal, the river Ganga flows through one-fourth territory of India, and its basin assists hundreds of millions of population. The river Ganga is one of the holiest rivers of the Hindus.  

Haridwar, Rishikesh, Allahabad, Varanasi, Kanpur, Jajmau, Ghazipur, Patna, Bhagalpur, Baharampur, Munger, Kolkata, Bijnor are some of the important cities of the Ganga valley.