Birka was a sky island far to the southeast from Skypiea until its destruction. It is only mentioned in the series and has never made an actual appearance. It is the birthplace of Enel and his followers.
In the English dub, the residents of Birka were known as Birkans. This name was not given in the original Japanese version of the manga or anime. This race was first seen in Chapter 241 and Episode 155.
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Like Shandia and the residents of Skypiea, Birkans are endowed with wings on their backs. However, they are differentiated from the other two races by how their wings face downwards. Enel, the leader of the Birkans, is an exception, as he has no wings at all, possessing a ring with drums on it instead.
Residents of Birka have a deal of variety in their appearance. Some of them possess goat-like facial features, having floppy growths resembling goat ears (though they also have normal human ears) and small horns. Unlike Skypieans and Shandia, the people of Birka tend to dress in long white robes, gowns, and other quasi-religious vestments. Their race appears on a drawing in Enel's mini-series, on an image that represented the three races of the Sky Islands; the drawing depicting a race with the same wings. Urouge, a pirate in the Blue Sea, also has a Birkan appearance.
Departure from Fairy Vearth
Their known history is that they were one of three races that once lived on the Moon and aided in the creation of the Automata. When resources on the moon dried up, they along with the Shandorians (ancestors of the Shandia) and the Skypieans left the moon and the Automata behind. They abandoned their city of Birka to settle life anew on the "Blue Star".
The Tides of History
At some point in history, the three races became separated from each other and fell into the individual races. The Birkans settled on a Sky Island apparently named after their former home, Birka. They also appeared to "forget" their origins, although the moon, known to them as the "Fairy Vearth" remained a folk tale amongst their people, believing it to be a place of dreams.
The End of Birka
Enel was born and raised on this island, but eight years ago he utterly destroyed his homeland with the power of his Devil Fruit, the Goro Goro no Mi. Enel then gathered his followers, left for Skypiea and made himself God there.
- The Supernova, Urouge is possibly a Birkan, as he possesses wings resembling those of the inhabitants.
- The real-life Birka was one of the most important trade centers in Scandinavia during the Viking Age.
- One Piece Manga and Anime — Vol. 30 Chapter 279 (p. 3-5) and Episode 182, McKinley talks about Birka.
- One Piece Manga — Vol. 48 –Vol. 49 Chapters 470–472, cover story: Enel's Great Space Operations Vol. 35-36, Murals depict the history of the moon races.
- One Piece Manga and Anime — Vol. 28 Chapter 257 (p. 7) and Episode 169, Gan Fall talks about mantra.
- One Piece Manga and Anime — Vol. 29 Chapter 274 and Episode 180, Enel explains his plan about Skypiea and Fairy Vearth.