Delhi is the second largest metropolis in India, with a population of 11.9 million, and a federally-administered union territory officially known as the National Capital Territory of Delhi (NCT). Located on the banks of the Yamuna River in northern India, it is one of the oldest continually inhabited cities in the world.
The National Capital Territory of Delhi is spread over an area of 1,483 km² (573 sq mi), of which 783 km² (302 sq mi) is designated rural and 700 km² (270 sq mi) urban. Delhi has a maximum length of 51.9 km (32 mi) and the maximum width of 48.48 km (30 mi). There are three local bodies (statutory towns) namely, Municipal Corporation of Delhi (area is 1,397.3 km² (540 sq mi)), New Delhi Municipal Committee (42.7 km² (16 sq mi)) and Delhi Cantonment Board (43 km² (17 sq mi)).
Delhi is located at [show location on an interactive map] 28°61′N, 77°23′E, and lies in northern India. It borders the Indian states of Uttar Pradesh on East and Haryana on West, North and South. Delhi lies almost entirely in the Gangetic plains. Two prominent features of the geography of Delhi are the Yamuna flood plain and the Delhi ridge. The low-lying Yamuna flood plains provide fertile alluvial soil suitable for agriculture. However, these plains are prone to recurrent floods. Reaching up to a height of 318 m (1043 ft), the ridge forms the most dominating feature in this region. It originates from the Aravalli Range in the south and encircles the west, northeast and northwest parts of the city. Yamuna, a sacred river in Hinduism, is the only major river flowing through Delhi. Most of the city, including New Delhi, lies west of the river. East of the river is the urban area of Shahdara. Delhi falls under seismic zone-IV, making it vulnerable to major earthquakes.
Kaolin deposits are found in an area west of Qutub Minar at Mehrauli, Masoodpur, Kusumpur and Mahipalpur. Small quantities of feldspar, quartz and beryl were reported incidental to production of kaolin. In addition, occurrences of Silica material known as Badarpur sand/quartzite were also reported from the state.