Patna is the capital and largest city of the state of Bihar in India. It had an estimated population of 1.68 million in 2011, making it the 19th largest city in India. With over 2 million people, its urban agglomeration is the 18th largest in India. The modern city of Patna is situated on the southern bank of river Ganges. The city also straddles the rivers Sone, Gandak and Punpun. The city is approximately 35 kms (22 miles) in length and 16 to 18 kms (9.9 to 11.2 miles) wide.