Manipur (Hindi: मणिपुर) is a state in northeastern India making its capital in the city of Imphal. Manipur is bounded by the Indian states of Nagaland in the north, Mizoram in the south and Assam in the west; it also borders the country of Myanmar to the east. The Meiteis, who live primarily in the state's valley region, is one of the primary ethnic groups. Their language, Meitei (also known as Meiteilon or Manipuri), is also the lingua franca in the state. It was recognized as one of India's national languages in 1992. Manipur is considered a sensitive border state. Foreigners entering Manipur (including foreign citizens born in Manipur) must possess a Restricted Area Permit which can be obtained from the Foreigners’ Regional Registration Office in the "metros" (Delhi, Mumbai, Kolkata) or certain other state government offices. Permits are valid for only 10 days, and visitors must travel only on tours arranged by authorised travel agents, in groups of four. Furthermore, they may come to Imphal only by air and will not be permitted to travel outside the capital.