Delhi (,
Dilli), officially the
National Capital Territory of Delhi, is the
capital territory of
India. Delhi is historically and culturally connected to both the
Upper Doab of the
Yamuna-
Ganges river system and the
Punjab region. It is bordered by
Haryana on three sides and by
Uttar Pradesh to the east. It is the largest city in India in terms of geographical area - about 1,484 square kilometers. It has a population of about 16.3 million, making it the
second most populous city and
second most populous urban agglomeration in India and in the world. Such is the nature of urban expansion in Delhi that its growth has expanded beyond the NCT to incorporate towns in neighbouring states and at its largest extent can count a population of about 25 million residents as of 2014.