Kolasib district
Kolasib district is one of the eleven districts of Mizoram state in India. It is the smallest district in Mizoram with an area of 1,386 km2(535 sq mi). Geography
The district is bounded on the north and northwest by Hailakandi district of Assam state, on the west by Mamit district, on the south and east by Aizawl district and on the northeast by Cachar district of Assam state. The district occupies an area of 1382.51 km². Kolasib town is the administrative headquarters of the district. Hydrology
Kolasib district has one completed Dam, Serlui B Dam and two under construction Bairabi Dam and Tuirial Dam Construction recommenced in September 2011. Divisions
The district has two R.D. Blocks: Bilkhawthlir and Thingdawl. It also has three assembly constituencies: Tuirial, Kolasib and Serlui. Demographics

According to the 2011 census Kolasib district has a population of 83,955, roughly equal to the nation of Andorra. This gives it a ranking of 620th in India (out of a total of 640). The district has a population density of . Its population growth rate over the decade 2001-2011 was 27.28%. Kolasib has a sex ratio of 956 females for every 1000 males, and a literacy rate of 93.50%. 55.84% of the population lives in urban areas. Scheduled Tribes make up 87.67% of the population. According to the 2011 census, 75.93% of the population spoke Mizo, 7.56% Hmar, 5.30% Bengali, 4.63% Tripuri, 1.90% Nepali and 1.33% Hindi as their first language. 