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For the chapter of the same name, see Chapter 101.

Reverse Mountain is a mountain at one of the points where the four Blues meet and is one of the two known entrances to the Grand Line.


This place is unique in that rivers from the Blues flow up the mountain, meet at the top, and then flow down into the Grand Line. This is due to the fact that the mountain, being a "Winter Island" using Grand Line terminology, is much colder than the surrounding sea in the Blues but not in the Grand Line. Many pirates entering the Grand Line die before they can even get up to the top of the mountain, because the hostile water currents and storms force them to crash into the mountain walls.[1]

On the rivers' borders are several gates built by an unknown hand. The Reverse Mountain Arc takes place here, specifically in the Twin Cape, the bottom of Reverse Mountain on the Grand Line's side.


Nami Explaining Reverse Mountain
Nami explaining the functions of Reverse Mountain.
About Reverse Mountain
Nami showing to the group the location of Reverse Mountain.


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Laboon Crocus


  1. 1.0 1.1 One Piece Manga and Anime — Vol. 12 Chapter 101 and Episode 61, Nami explains about the Reverse Mountain.

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Red Line
Locations: Reverse Mountain (Twin Cape)  •  Mary Geoise (Pangaea Castle)  •  Fish-Man Island (Ryugu Kingdom)  •  Red Port
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