Dibrugarh is known as the Tea City of North-East. Dibrugarh derived its name from Dibarumukh (as a renowned encampment of Ahoms during the Ahom Sutiya War). The Ahom had constructed a garh (Fort) in the mouth of river Dibaru to prevent the soldiers of Chutia king and it was known as a Dibrumukhar garh. This garh of Ahom days is no more to see at present as it was completely eroded due to erosion of the rivers Brahmaputra and Dibru. But according to some historians of modern days, the origin of name Dibrugarh is said to be days of British rule in the middle of eighteenth century. The garh which was constructed near Dibrugarh town in the mouth of Dibaru river by the British was termed as Dibrumukhargarh. It is fact that the garhs which were constructed by the Ahom and the British at different time were for defence purposes. The garh which was established by the British is also no more now due to the same reason by which the garh of Ahom period was eroded by the river Brahmaputra. The name ‘Dibrugarh’ might have come up from the word “Dibrumukhar Garh” and its wide use has naturally come up from modern days. However, it cannot be denied that the origin of this name was in Ahom period. Dibrugarh became a separate district when it was split from Lakhimpur in 1976. Further, in 1989 Tinsukia district was curved out from Dibrugarh