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For other usage, see Moon (Disambiguation).

The Moon is a giant celestial body, a rock-composed sphere, that orbits the world. For the world's inhabitants, it is typically the main (if not only) source of natural light at nighttime.


Under the crescent moon, Kuro becomes very bloodthirsty.

The moon appears throughout the series, but the first time the moon was seen was when Zoro fought Kuina in his childhood flashback.[1] Later Kuro used the moon as a signal to carry out his three-year plan; the sight of a crescent moon makes him uncontrollably murderous.[2][3] During the sequences that influence Kuro, the moon was shown to be a red-orange crescent. In subsequent appearances the moon begins to be hard-sketched.

During Nico Robin's flashback of Ohara, a model of the world with seven satellites (which includes their world's moon) can be seen inside the library of the Tree of Knowledge.[4] The model was destroyed when the Buster Call attack caused the tree to collapse.[citation needed]

Traveling to the moon seems to be considerably easier than in real life, as Enel managed to go there using the Ark Maxim,[5] and the four automata managed to go there traveling in balloons.[6]

Carrot transforms into her Sulong form.

During nights in which the full moon is visible, members of the Mink Tribe can look at it to transform into their Sulong form, which they can maintain as long as their sight to the moon remains unobstructed.[7]

Ancient Civilization

Enel in front of the ancient city Birka.

There is an ancient city on the moon named Birka (ビルカ Biruka?), where technology and architecture were highly advanced. The city's name is the same as Birka, a Sky Island far to the southeast of Skypiea.[8]

From paintings on the walls, some of the city's history is revealed: it was home to "Moon People" (月の人 Tsuki no Hito?, Viz: "Mooninites")—the ancestors of Skypieans, Shandorians, and Birkans, but one day they left Birka and headed to the main planet due to lack of resources on their homeland. They left their creations on the moon: the robot-like creatures named automata.[9] It is unknown when their emigration took place, but it was at least 1,100 years ago, since it was at that time that the city of Shandora was prosperous.[10]

The descendants of the citizens who left the moon appear to have forgotten their origins, although the moon, called "Fairy Vearth" and believed to be a place of dreams, remains a folk tale amongst the Birkans. Enel, after studying history within the Upper Yard, came to the belief that the moon is the legendary land that he sought: an endless land of sacred dirt, also known as "Vearth". This is the reason that he constructed the Ark Maxim.[5]

The ancient population of Birka.

The city, which was in an underground basement within the moon's surface, has been uninhabited for a long time, and has long since fell into ruin. Despite this, the city retains its advanced look, with the automata being in capsules with inactive electric generators and machinery.[11] The Space Pirates had been digging into the ruins while also warring with the four automata that were created by Dr. Tsukimi.

During his adventures on the moon, Enel eventually finds the ruins of Birka after defeating the Space Pirates and gaining the loyalty of the four automata he had rescued from certain death. After reading the murals on the walls, he recharged the ancient automata and decided to settle there.[12][13]

Moons Progressions

During the early chapters, it was possible to use the moon to create an estimated time span for Luffy's adventures, presuming the One Piece world's time span is equal to that of Earth's. In some cases, the phase of the moon even gave the chapter its title. Over time, however, this idea seemed to have been retired, and it is no longer possible to use the moon as a time scale. The full moon later plays a part as the minks' Sulong form was introduced.


  • The ancient lunar city, Birka, may have been named after the real-life Birka, a Viking-age trading center in Sweden.
  • The minks's Sulong transformation is similar to the myth about Werewolves, who would also transform from humans into a ferocious bipedal animal (wolves) under the light of the full moon.


  1. 1.0 1.1 One Piece Manga and Anime — Vol. 1 Chapter 5 (p. 11) and Episode 19, Zoro's final duel with Kuina takes place under a full moon. Note that the anime moves this flashback to the beginning of the Baratie Arc.
  2. 2.0 2.1 One Piece Manga and Anime — Vol. 4 Chapter 28 (p. 7) and Episode 12, Kuro's bloodthirstiness is triggered by a crescent moon.
  3. One Piece Manga and Anime — Vol. 5 Chapter 37 (p. 10-16) and Episode 15, Kuro's flashback reveals how he murdered all the Marines under a crescent moon.
  4. One Piece Manga and Anime — Vol. 41 Chapter 392 (p. 3) and Episode 275, The model of the world can be seen within the Tree of Knowledge.
  5. 5.0 5.1 One Piece Manga and Anime — Vol. 32 Chapter 300 (p. 12-13) and Episode 193, A defeated Enel decides to travel to Fairy Vearth, the moon, alone.
  6. One Piece Manga — Vol. 47 Chapter 453, cover story: Enel's Great Space Operations Vol. 21, Automata created by Tsukimi are revealed to have traveled to the moon by balloon.
  7. One Piece Manga — Vol. 88 Chapter 888 (p. 10-12), Carrot transforms into her Sulong from.
  8. One Piece Manga and Anime — Vol. 30 Chapter 279 (p. 4) and Episode 182, Birka is mentioned by McKinley.
  9. One Piece Manga — Vol. 48Vol. 49 Chapters 470472, cover story: Enel's Great Space Operations Vol. 35-36, Enel reads the murals to learn the history of the Sky People.
  10. One Piece Manga and Anime — Vol. 28 Chapter 261 (p. 12-14) and Episode 172, Nico Robin reads about Shandora's history.
  11. One Piece Manga — Vol. 48 Chapters 465 and 466, cover story: Enel's Great Space Operations Vol. 30-31, Enel finds the inactive ruins of Birka within a cavern.
  12. One Piece Manga — Vol. 48 Chapters 467470, cover story: Enel's Great Space Operations Vol. 32-35, Enel reactivates the automata.
  13. One Piece Manga — Vol. 49 Chapters 473 and 474, cover story: Enel's Great Space Operations Vol. 37-38, Enel settles down in Birka.

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