Wonderful Bhola Cyclone, Bangladesh 1970 (Nov. 12) Bay of Bengal 300,000-500,000 2.5° North - 6° Northeast 9° South Himalayan Bay of Bengal, India (Apr. Hooghly River Cyclone, India and Bangladesh 1737 Bay of Bengal 300,000 3.4 percent, and 1737 Bay of Sree Narayana 300 4.