Dibrugarh (pron: ˌdɪbru:ˈgɑ:) is an industrial city in Upper Assam with sprawling tea gardens. It is located 435 kms East from the state capital of Dispur. It serves as the headquarters of Dibrugarh district in the state of Assam in India. Dibrugarh serves as the headquarters of the Sonowal Kachari Autonomous Council, which is the governing council of the Sonowal Kachari tribe (found predominantly in the Dibrugarh district). Dibrugarh derived its name from Dibarumukh (as a renowned encampment of Ahoms during the Ahom-Chutia conflict). Either the name “Dibru” evolved from Dibaru river or from the Bodo-Kachari word “Dibru” which means a “blister” and “Garh” meaning "fort". The Bodo-Kacharis add the prefix “Di-” (which means “water”) wherever there is small stream, a river, or a large river in a town or city. Dibrugarh has a humid subtropical climate (Köppen climate classification Cwa) with extremely wet summers and relatively dry winters. Dibrugarh city had a population of . Males constituted 54% of the population and females 46%. The sex ratio of Dibrugarh city was 961 per 1000 males. The average literacy rate of Dibrugarh is 89.5%, which is higher than the national average literacy rate. In Dibrugarh, 9% of the population is between 0 and 6 years of age, and the child ratio of girls is 940 per 1000 boys. Dibrugarh city area has a population of 154,296 according to a 2011 census. The Dibrugarh metropolitan areas include Barbari (AMC AREA), Dibrugarh, and Mahpowalimara Gohain Gaon Dibrugarh city have a population of 154,296 as per 2011 census. Assamese is spoken by 64,223 people, Bengali at 36,283, Hindi at 33,011, Bhojpuri by 5,533 people, Nepali at 1,609 and 11,911 people speaks other languages. The first oil well dug during the British era was in Digboi, from Dibrugarh. Today, Duliajan, Dikom, Tengakhat and Moran are the key locations for oil and gas industry in the district. Oil India Limited, the second public sector company in India engaged in exploration and transportation of crude oil has its field headquarters in Duliajan, 50 km from Dibrugarh city.