[3][4] Dibrugarh,1 Golaghat2 and Jorhat3 are also the oldest recognised and constantly inhabited urban centres (municipal areas) in the region based on the earliest years of formation of the civic bodies, constituted before the Indian independence of 1947.

An extended list of Upper – Assam region also includes the districts of Sonitpur, Karbi Anglong & Nagaon.

It was a powerful kingdom which had ruled in northeastern Assam and some areas of present-day Arunachal Pradesh, with the capital at Sadiya.

The kingdom became weaker with the rise of the Moamoria rebellion, and subsequently fell to a succession of Burmese invasions.

With the defeat of the Burmese after the First Anglo-Burmese War and the Treaty of Yandabo in 1826, control of the kingdom passed into British (East India Company) hands.