North-Eastern Zonal Council has eight states viz, Sikkim, Arunachal Pradesh, Meghalaya, Nagaland, Manipur, Mizoram, Tripura, Assam. Taking states and UTs together, the Northern zonal council has the maximum number of states and UT.
Tripura has the highest number of primate species found in any Indian state. Tripura is a landlocked state in North East India. Tripura became a Union Territory on 1 July, 1963, and attained the status of a full-fledged state on 21 January, 1972. Tripura has a tropical savanna climate. The ancient name of Tripura is Kirat Desh or “The land of Kirat”.