Delhi, Capital of India and the third largest city in India, lies at an altitude of between 700 and 1,000 feet (213 and 305 metres) and covers an area of 1,485 square kilometers. Situated on the Yamuna River (a tributary of the Ganges River) Delhi is bordered on the east by the state of Uttar Pradesh and on the north, west, and south by Haryana. It generally has been presumed that the city was named for Raja Dhilu, a king who reigned in the 1st century BC , and that the various names by which it has been known (Delhi, Dehli, Dilli, and Dhilli) have been corruptions of this name
Delhi is surrounded by a high stone wall, erected in 1638, and is approached through seven arched gateways, including the Delhi Gate in the south, the Ajmer Gate in the east, and the Kashmir Gate in the north. Within the walls is a maze of congested narrow streets, alleys, busy bazaars, and some of the nation's most spectacular Indo-Muslim architectural features.