Calm Belt, One Piece Wiki

The Calm Belts are two areas of ocean that border the north and south of the Grand Line. The Calm Belts are very effective barriers for those trying to enter the Grand Line; these areas are always completely calm, never having any ocean currents or winds blowing, making it impossible for non-self propelled ships to travel through. They are also nesting grounds for the world's largest Sea Kings. The Straw Hat Pirates encountered the Sea Kings and were caught on top of one of their heads after ina

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