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The Grand Line is bordered on the north and south by the Calm Belts, two oceanic regions in the One Piece series.
It is impossible for non-self-propelled ships to pass through the Calm Belts since they are always absolutely calm, never having any winds or ocean currents flowing, and are therefore very effective barriers for those attempting to reach the Grand Line. The largest Sea Kings in the world have their largest nests here.
The Seastone liner at the bottom of the Marines' ships allows them to travel safely through the Calm Belts. This appears to keep the Sea Kings from noticing the ship passing overhead.
Calm Belt doesn’t have many islands unlike the rest of the ocean areas of North, South, East, and West Blues.
Name | Calm Belt |
Anime Debut | One Piece Episode 54 "Foreboding of a New Adventure! The Puzzling Girl, Apis" |
Manga Debut | Chapter 101 “Reverse Mountain” |
One of the few places that is known to be inside one of the Calm Belts is the island of Amazon Lily. The island has historically been protected from invaders by its location within a Calm Belt. The only person known to have successfully swam to Amazon Lily without much hindrance from the Sea Kings is Silvers Rayleigh.
Northwest of Amazon Lily in the Calm Belt is the island of Rusukaina.
In the center of the Calm Belt, on the seafloor, is the Great Prison, Impel Down. It is nearly impossible to enter or exit due to the strict security and Sea Kings.
Boa Hancock | Shakuyaku | Gloriosa |
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Boa Sandersonia | Boa Marigold | Ran |
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Hannyabal | Magellan | Domino |
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The real-world horse latitudes, or the 30° latitudes encircling the equator where historically weak winds caused ships to become trapped, may serve as the inspiration for the Calm Belts.
A. Calm Belt has no winds or ocean currents, which makes it impossible for any non-self-propelling ship to cross through it.
A. The world's waters are home to enormous, carnivorous beasts known as sea kings. They are particularly common in the Calm Belts that encircle the Grand Line.
A. Rayleigh swam through the Calm Belt defeating Sea Kings after the Summit War at Marineford.
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