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Aerial view of the Ganges River Delta formed by the Brahmaputra and the Ganges Rivers. Also known as the Ganges-Brahmaputra-Meghna (GBM) River Basin, the riverine confluence forms one of the largest river systems in the world. At the Bay of Bengal, the mouth forms the Ganges River Delta, the largest river delta in the world. The Ganges (Ganga) River and its surrounding watershed supports one of the most fertile and densely populated regions on the planet.