In the sixteenth century Christianity brought to the historic region of Bengal (now divided between Bangladesh and India) by Portuguese traders and missionaries. Aside from Bengali Christians, a significant number of the population in Bangladesh are Christians.
Most of the areas of Bangladesh lies within the broad delta formed by the Ganges and Brahmaputra rivers. Lands are exceedingly flat, low-lying, and subject to annual flooding. Much fertile, alluvial soil is deposited by the floodwaters. The only significant area of hilly terrain, constituting less than one-tenth of the nation's territory, is the Chittagong Hill Tracts in the narrow southeastern panhandle of the country.