Wikipedia Asian Month 2016/Onsite edit-a-thon/Kolkata

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Kolkata(also known by its former official name of Calcutta)is the capital of the Indian state of West Bengal. Located on the east bank of the Hooghly River, it is the principal commercial, cultural, and educational centre of East India, while the Port of Kolkata is India's oldest operating port and its sole major riverine port. In 2011, the city had population of 4.5 million, while the population of the city and its suburbs was 14.1 million, making it the third-most populous metropolitan area in India. In 2008 its gross domestic product (adjusted for purchasing power parity) was estimated to be US$104 billion, which was the third highest among Indian cities, behind Mumbai and Delhi.