The Ganges-Brahmaputra Delta, also known as the Sunderbans, is the world's largest delta spanning approximately 105,000 square kilometers across Bangladesh and India. It forms where the Ganges and Brahmaputra rivers (and Meghna) empty into the Bay of Bengal. The Nile Delta (option A), Danube Delta (option B), and Mississippi Delta (option D) are all significant but smaller in comparison.