Dibrugarh is an administrative district in the state of Assam in India. The district headquarters are located at Dibrugarh city. The district occupies an area of 3381 km².Dibrugarh which is the headquarter of the district derived its name from Dibrumukh. The name derived from the mouth(mukh) of the river Dibru or Dibru (Dimasa kachari word dibru, a blister) during the reign of Suhungmung[when?], Pharsengmung Borgohain, Chao Siulung, Kilong fought against the Sutiya king who was defeated in the battle and surrendered before the Ahom King.