Northeast India (officially called North Eastern Region, NER) is the eastern-most region of India. It comprises eight states – the contiguous Seven Sister States (Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, and Tripura), and the Himalayan state of Sikkim. The language and culture of Northeast is a mix of Tibetan, South-East Asian and East Indian culture.

Source: https://en.wikipedia.org/wiki/Northeast_India