The Ganga Brhamaputra Meghna basin made the geographical area of the eastern part of India and Bangladesh. A river network and the world’s largest mangrove forest are the integral part of these two countries. Environmental interdependence shaped by geographical position make a common platform. So environmental issues became integral part of India Bangladesh relations. Impact of barrages on nature, hydro environmental issues, Sundarban as common ecological asset, effect of natural hazards, impact of climate change, losses of lives and livelihood due to natural hazards etc. are the defining features of environmental aspect of India Bangladesh relations.