Focusing trans-boundary water regime of Ganges- Brahmaputra- Meghna (GBM) basin, this situation analysis paper discusses the core issues related to environmental security through analyzing various environmental impacts and its significance at the national and regional level. Specifically, the scope of this paper pertains to transboundary water relations between Bangladesh and India, since these two neighbouring countries’ environment and livelihood depend heavily on the rivers of the GBM basin and any unilateral or asymmetrical management practice or decision will bring
catastrophic damages to the whole region.