This is Arunachal Pradesh District Map Arunachal Pradesh is a state in northeast India. It was formed from the North-East Frontier Agency region, and India declared it as a state on 20 February 1987. Itanagar is its capital and largest town. It borders the Indian states of Assam and Nagaland to the south. Arunachal Pradesh is a state in northeast India. It was formed from the North-East Frontier Agency region, and India declared it as a state on 20 February 1987. Itanagar is its capital and largest town. It borders the Indian states of Assam and Nagaland to the south.