The prololonged tribal conflict and violence in Manipur has given a message to the Nation that the North-East and its related problems have to be given priority . Eight States comprise India's northeast- Assam, Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland and Tripura and Sikkim. It is linked with Indian heartland through the 21 km. wide Siliguri Corridor, which is commonly known as the chicken neck, created by the Radcliff line, the boundary drawn by the British colonial administration. North East India having border with five countries holds great strategic importance to the country.North-eastern part of India has the landscape with potential racial, lingual and ethnic diversity which creates also  ethnic tension and conflict. . Manipur is a multi-ethnic state located in Northeast India witnessing a divisive politics of identity and acute ethnic conflict. The complexity of ethno-demographic relationships and subsequent conflicts in Manipur can however provide a wider theoretical framework explaining a particular pattern of conflict. conflicts have been waged not merely on questions of land, immigration and settlement, but also on the overweening fear of loss of identity itself. Due to these conflicts there are so many problems of extremism, Internal unrest, Narco- terrorism, Conversion, Naxalism etc -and due to these problems anti nation forces rapidly grown here. It is a big challenge for  Internal security of India.Following a socio-historical, cultural perspective, this paper attempts to describe about India’s Internal security concerns in North East dimensions ,with special reference to Manipur Ethnic conflict.

Keywords:
North East, Chicken Neck, Radcliff line, Ethnic diversity, Internal Security, Extremism, Narcoterrorism,