Birka

Bilka (ビルカ, Biruka) was a sky island far to the southeast from Skypiea. It was only mentioned. Enel was born and raised on this island. But 6 years ago he destroyed his homeland and came to Skypiea with his men. Bilka was said to be home to many strong warriors, powerless before Enel, however.

The island shares its name with an ancient city on the moon.

First mention Chapter 279