The ethno-linguistic composition of the population of South Asia, that is the nations of India, Pakistan, Bangladesh, Nepal, Bhutan, Maldives and Sri Lanka is highly diverse. The majority of the population fall within two large linguistic groups, Indo-Aryan and Dravidian. Indian society is traditionally divided into castes or clans, not ethnicities, and these categories have had no official status since independence in 1947, except for the scheduled castes and tribes which remain registered for the purpose of affirmative action. In today's India, the population is categorized in terms of the 1,652 mother tongues spoken.These groups are further subdivided into numerous sub-groups, castes and tribes. Indo-Aryans form the predominant ethno-linguistic group in Northern India, Bangladesh, Pakistan, Nepal, Sri Lanka and the Maldives. Dravidians form the predominant ethno-linguistic group in southern India and the northern and eastern regions of Sri Lanka, and a small pocket in Pakistan. Certain Iranian speaking peoples also have a significant presence in South Asia, the large majority of whom are located in Pakistan, with heavy concentrations in Balochistan, Khyber-Pakhtunkhwa and Federally Administered Tribal Areas. Dardic peoples form a minority among the Indo-Aryans. They are classified as belonging to the Indo-Aryan language group, though sometimes they are also classified as external to the Indo-Aryan branch. They speak an Iranian language which is not at all related to Indian languages. They are found in northern Pakistan (Northern Areas and Khyber-Pakhtunkhwa) and in Jammu and Kashmir, India.Minority groups not falling within either large group mostly speak languages belonging to the Austroasiatic and Tibeto-Burman language families, and mostly live around Ladakh and Northeast India, Nepal, Bhutan, and the Chittagong Division of Bangladesh. The Andamanese (Sentinel, Onge, Jarawa, Great Andamanese) live on some of the Andaman Islands and speak a language isolate, as do the Kusunda in central Nepal, the Vedda in Sri Lanka, and the Nihali of central India, who number about 5000 people. The people of the Hunza valley in Pakistan are another distinct population. They speak Burushaski, a language isolate.The traditions of different ethnic groups in South Asia have diverged, influenced by external cultures, especially in the northwestern parts of South Asia (where Turkic and Iranian peoples have had much influence) and in the border regions and busy ports, where there are greater levels of contact with external cultures. This is particularly true for many ethnic groups in the northeastern parts of South Asia who are ethnically and culturally related to peoples of the Far East. The largest ethno-linguistic group in South Asia are the Indo-Aryans, numbering around 1 billion, and the largest sub-group are the native speakers of Hindi languages, numbering more than 470 million.These groups are based solely on a linguistic basis and not on genetic basis. Genetically all south Asians are a mixture of Indian and Indo-European genetics.
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