or Ganges-Brahmaputra delta
Region in West Bengal state, India, and Bangladesh.
An area of about 220 mi (354 km) wide along the Bay of Bengal , it is covered by the streams forming the mouths of the Ganges (Ganga) and Hugli River . Many smaller streams of the delta form a swamp region (about 6,526 sq mi [16,902 sq km] in area) known as the Sunderbans. The delta was struck in 1970 by one of history's most devastating cyclones.