North India is a geographic and linguistic-cultural region of India. In traditional Indian geography, India is divided into five major zones: North India, North-East India, East India , West India and South India. The Vindhya mountains, in particular the line marked by the Narmada River and the Mahanadi River marks the southern boundary of north India. The line made by the Son river and the Kosi river marks its eastern border. The dominant geographic feature of northern India is the Indo-Gangetic Plain.. . However, the socio-cultural boundaries of north India have actually surpassed these traditional boundaries. As a linguistic-cultural and political region, North India consists of twelve Indian states: Jammu and Kashmir, Himachal Pradesh, Uttaranchal, Haryana, Punjab, Uttar Pradesh, Bihar, Jharkhand, Chhatisgarh, Madhya Pradesh and Rajasthan (Bihar and Jharkhand are also considered as parts of East India). The National Capital Territory of Delhi is also a part of northern India. It shares most of its cultural, historical, musical, and linguistic heritage with neighboring Pakistan, which was part of the region prior to Partition.. . North India remains primarily rural, but its vast population has ensured that it has always supported very large cities: apart from the great metropolis of Delhi, the cities of Lucknow, Patna, Kanpur, Allahabad, Varanasi, Meerut, Jaipur, Chandigarh, Ludhiana, Amritsar, Jalandhar, Patiala, Jammu, Bhopal and Indore would rank with the most populous cities of Europe.. . People. . Anthropologists often associate regional affinities with racial differences. South Indian or "Dravidian" states usually have people with darker skin. People in the states of Eastern Kashmir, Sikkim, Arunachal Pradesh, and other Northeastern Indians states tend to look more East Asian. North India shows a stronger Aryan influence. Indeed, the languages of northern India are preponderantly Indo-Aryan, and it is in this region that Sanskrit and the various Prakrits are thought to have first found a home in India. Also, although skin colour in all parts of India varies by caste rather than region, it is generally speaking the case that inhabitants of the north Indian states have lighter skin than those of their caste counterparts in southern or eastern India. These phenotypic variations are indubitably due to the ingress, across many millennia and in every era, of Central Asian invaders (including "Indo-Greeks", "Indo-Parthians", Sakas, Kushanas, Hunas or Huns, and Turks) into the Indo-Gangetic. . North India shows a fuller range of Caste (varna, literally:"colour") variation than does South India – there are proportionately more kshatriya and vaishya castes than is generally the case in most areas of South India.. . In terms of religion, North India is generally speaking a stronghold of Vaishnava sects of Hinduism; Shaktism and Shaivism. North Indians generally believe in unity of God and that Shiva, Vishnu, and Brahma constitute the trīmurtī, or trinity. Having been ruled for nearly eight centuries by Muslim invaders from Central Asia, North India is the main centre of Islam in India.. . North India also forms the heartland of the so-called "Cow Belt" of India, which stretches from Indo-Gangetic Plain towards other conservative states like Gujarat, where BJP is particularly efficient in politics and has its traditional support base.. . . [edit] Traditional economy. . The economy of northern India, especially the region surrounding the Delhi metropolitan area is growing at a remarkable pace. Shown here are commercial buildings in Gurgaon, Haryana.The economy of this region is predominantly agrarian; culturally, socially and historically the country has always been defined by its village societies. It is therefore proper to devote space to a detailing of the north Indian socio-agrarian structure.. . North India largely retains a feudal agricultural setup, with a preponderence