Bangladesh, Bhutan, India, and Nepal in the Eastern Himalayas are interconnected by the common river systems of the Ganges, Brahmaputra, and Meghna (GBM). The GBM basin is home to approximately 700 million people, comprising over 10% of the world's population. The economy and environment of the region depend on water, but while the need for water is increasing, poor management and climate-related effects are making water supplies erratic.