Chhatak (formerly known as Chhatir Bazaar) (Pronounced 'Sa-thokh') 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 km². 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