Dimapur is the largest city in Nagaland, India. The Assam government leased it out for 99 years after Nagaland was carved out of Assam in 1963. It was leased out for its strategic location—it is the only plains tract of hilly Nagaland and had a railway station and airport space for connectivity and economic activity in the new state. In the Middle Ages, it was the capital of the Dimasa Kachari rulers. In the heart of the town there is an old relic of the Dimasa Kachari Kingdom which speaks about the once prosperous era. It is bounded by Kohima district on the south and east, Karbi Anglong district of Assam on the west, the Karbi Anglong and stretch of Golaghat District of Assam, in the west and the north. Dimapur, from a Kachari word 'Dimasa' after the river which flows through it, is the gateway to Nagaland and its only railhead. The city also has the only functional airport in the state.