what is "tropical cyclone basins"?
They are divided into seven basins. These include the "North Atlantic Ocean", the eastern and western parts of the "North Pacific Ocean", the southwestern “Pacific Ocean", the southwestern and southeastern "Indian Ocean", and the northern "Indian Ocean" i.e. "Arabian Sea" and "Bay of Bengal".
Tropical cyclone basins
Traditionally, areas of tropical cyclone formation are divided into seven basins. These include the north Atlantic Ocean, the eastern and western parts of the northern Pacific Ocean, the southwestern Pacific, the southwestern and southeastern Indian Oceans, and the northern Indian Ocean (Arabian Sea and Bay of Bengal). 
where do cyclones occur in the southern hemisphere They generally form on a regular basis between the African coast and the middle of the South Pacific.
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Tropical cyclone basins [SEP] Introduction
Traditionally, areas of tropical cyclone formation are divided into seven basins. These include the north Atlantic Ocean, the eastern and western parts of the northern Pacific Ocean, the southwestern Pacific, the southwestern and southeastern Indian Oceans, and the northern Indian Ocean (Arabian Sea and Bay of Bengal). The western Pacific is the most active and the north Indian the least active. An average of 86 tropical cyclones of tropical storm intensity form annually worldwide, with 47 reaching hurricane/typhoon strength, and 20 becoming intense tropical cyclones, super typhoons, or major hurricanes (at least of Category 3 intensity).