Chhatak is a town in northeastern Bangladesh, on the Surma River, Sunamganj district, Sylhet division. It has a population of 34,498 and an area of 9.24 kmĀ². Chhatak expanded rapidly following the discovery of a natural gas field nearby in 1959. As well as the work generated in extracting gas, the town also has a number of industries powered by natural gas, including the largest cement plant in Bangladesh (due to go into production at the end of 2005)