Bangladesh is a land of rivers. Flood and bank erosion since pre historic period had become one of the major aspects of discussion for its direct interaction with physical and socio-cultural environment. As we know regular variation is exposed by this river from upstream to downstream at different reaches in the Ganges River. Ganges River is considered as a frequent bankline migrant and unstable river of the country. This research intends to identify the shifting pattern of the Ganges River courses accordingly using Rennell map in 1760s and Landsat Imageries (MSS-1975; TM-1995, and ETM+ 2015). As Landsat TM band 4 (0.76 - 0.90 µm) is suitable for land-water interfaces separation the Ganges river basin and have been delineated the land and water classification using this band. The size, shape and direction of Ganges River gradually changed over more than 250 years.