Agra the former capital of Hindustan , is a city on the banks of the river Yamuna in the northern state of Uttar Pradesh, India, 363 kilometres (226 mi) west of state capital, Lucknow and 200 kilometres (124 mi) south of the national capital New Delhi. With a population of 1,686,976 (2010 est.), it is one of the most populous cities in Uttar Pradesh and the 19th most populous in India. Because 80 percent of the city’s sewage flows into Yamuna River, it is 20th most polluted city in India. Agra can also refer to the administrative district that has its headquarters in Agra city.