Delhi, officially the National Capital Territory (NCT) of Delhi, is a city and a union territory of India containing New Delhi, the capital of India. Straddling the Yamuna river, primarily its western or right bank, Delhi shares borders with the state of Uttar Pradesh in the east and with the state of Haryana in the remaining directions. The NCT covers an area of 1,484 square kilometres (573 sq mi). According to the 2011 census, Delhi's city proper population was over 11 million, while the NCT's population was about 16.8 million. Delhi's urban agglomeration, which includes the satellite cities of Ghaziabad, Faridabad, Gurgaon and Noida in an area known as the National Capital Region (NCR), has an estimated population of over 28 million, making it the largest metropolitan area in India and the second-largest in the world (after Tokyo).The topography of the medieval fort Purana Qila on the banks of the river Yamuna matches the literary description of the citadel Indraprastha in the Sanskrit epic Mahabharata; however, excavations in the area have revealed no signs of an ancient built environment. From the early 13th century until the mid-19th century, Delhi was the capital of two major empires, the Delhi sultanate and the Mughal Empire, which covered large parts of South Asia. All three UNESCO World Heritage Sites in the city, the Qutub Minar, Humayun's Tomb, and the Red Fort, belong to this period. Delhi was the early centre of Sufism and Qawwali music. The names of Nizamuddin Auliya and Amir Khusrau are prominently associated with it. The Khariboli dialect of Delhi was part of a linguistic development that gave rise to the literature of the Urdu language and then of Modern Standard Hindi. Major Urdu poets from Delhi include Mir Taqi Mir and Mirza Ghalib. Delhi was a major centre of the Indian Rebellion of 1857. In 1911, New Delhi, a southern region within Delhi, became the capital of the British Indian Empire. During the Partition of India in 1947, Delhi was transformed from a Mughal city to a Punjabi one, losing two-thirds of its Muslim residents, in part due to the pressure brought to bear by arriving Hindu refugees from western Punjab. After independence in 1947, New Delhi continued as the capital of the Dominion of India, and after 1950 of the Republic of India. Delhi ranks fifth among the Indian states and union territories in human development index. Delhi has the second-highest GDP per capita in India (after Goa). Although a union territory, the political administration of the NCT of Delhi today more closely resembles that of a state of India, with its own legislature, high court and an executive council of ministers headed by a Chief Minister. New Delhi is jointly administered by the federal government of India and the local government of Delhi, and serves as the capital of the nation as well as the NCT of Delhi. Delhi is also the centre of the National Capital Region, which is an "interstate regional planning" area created in 1985. Delhi hosted 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 and was one of the major host cities of the 2011 Cricket World Cup.

South Delhi is an administrative district of the National Capital Territory of Delhi in India with its headquarters in Saket. Administratively, the district is divided into three subdivisions, Saket, Hauz Khas, and Mehrauli. It is bounded by the Yamuna River to the east, the districts of New Delhi to the north, Faridabad District of Haryana state to the southeast, Gurgaon District of Haryana to the southwest, and South West Delhi to the west. South Delhi has a population of 2,731,929 (2011 census), and an area of 250 square kilometres (97 sq mi), with a population density of 9,034 persons per km2 (23,397 persons per mi2). The South Delhi neighborhood of Hauz Khas is witnessing the growth of trendy shops and lodgings. It is now becoming the center for domestic and international tourists and backpackers. The area also is home to historical monuments and has easy access to the Delhi Metro, making it a preferred location for many visitors to India and domestic middle-class visitors from other Indian states. The area attracts young tourists with numerous hip hostels and cafes.The division shown on the map bears only administrative significance, as to the common citizen, broadly speaking Delhi is vaguely ring-like, having five regions, namely North, West, South, East and Central. The usage of the term South Delhi in day-to-day life expands from Delhi's IGI Airport in the New Delhi district to the river Yamuna in the South East, a region protruding into administrative South West Delhi district.