The National Capital Territory (NCT) of Delhi, sometimes known as Delhi, is a city and union territory in India that houses New Delhi, the nation's capital. Delhi shares borders with the states of Uttar Pradesh in the east and with the state of Haryana in the remaining directions as it spans the Yamuna river, particularly on its western or right bank. The NCT is 1,484 square kilometers in size (573 sq mi). The NCT has a population of about 16.8 million people, compared to about 11 million people living in Delhi's city proper, as per the 2011 census. With an estimated population of over 28 million, Delhi's urban agglomeration—which also includes the satellite cities of Ghaziabad, Faridabad, Gurgaon, and Noida in the National Capital Region (NCR)—is the second-largest metropolitan area in the globe and India (after Tokyo). The medieval fort Purana Qila's geography corresponds to the literary description of the citadel Indraprastha in the Sanskrit epic Mahabharata, although no evidence of an ancient constructed environment has been found during local excavations. The Delhi Sultanate and the Mughal Empire, which controlled a vast portion of South Asia, shared Delhi as their capital from the early 13th century to the mid-19th century. The Qutub Minar, Humayun's Tomb, and the Red Fort are all a part of this time period and are the city's three UNESCO World Heritage Sites. The early epicenter of Qawwali music and Sufism was Delhi. It is frequently linked to Nizamuddin Auliya and Amir Khusrau by their names. Delhi's Khariboli dialect was a product of a linguistic process that also produced Urdu and later Modern Standard Hindi literature. The prominent Urdu poets Mir Taqi Mir and Mirza Ghalib are both from Delhi. Delhi served as a key hub for the 1857 Indian Rebellion. New Delhi, a southern section of Delhi, was named the British Indian Empire's capital in 1911. Due in part to pressure from migrating Hindu refugees from western Punjab, Delhi underwent a transformation from a Mughal metropolis to a Punjabi one during the Partition of India in 1947, losing two-thirds of its Muslim population. New Delhi remained the nation's capital when India attained independence in 1947, and then after 1950, it became the Republic of India. In terms of the human development index, Delhi is ranked fifth among the Indian states and union territories. The second-highest GDP per capita in India is found in Delhi (after Goa). Despite being a union territory, the political structure of the NCT of Delhi today is more akin to that of an Indian state, complete with its own high court, legislature, and executive council of ministers presided over by a Chief Minister. The municipal government of Delhi and the federal government of India jointly administer New Delhi, which acts as both the nation's and the NCT of Delhi's capital. The National Capital Region, an "interstate regional planning" area established in 1985, is also centered in Delhi. In addition to being one of the major host cities for the 2011 Cricket World Cup, Delhi held the inaugural 1951 Asian Games, the 1982 Asian Games, the 1983 Non-Aligned Movement summit, the 2010 Men's Hockey World Cup, the 2010 Commonwealth Games, and the 2012 BRICS summit.
