One Piece: Umi no Heso no Daibouken-hen is a special anime that premiered in fall 2000, produced by Toei Animation.

About the production: the story comes from a manga, there is 1 episode of about 49 minutes and its current status is "finished".

Its main genres are adventure, comedy and fantasy, with themes such as Shounen, Pirates, Male Protagonist and Super Power.

On AniList, One Piece: Umi no Heso no Daibouken-hen has an average score of 67%, a good score, and appears on 10,369 users' lists.

The Straw Hats encounter a city in the middle of a whirlpool, called the Ocean's Navel, that is being destroyed by giant monsters. These monsters supposedly protect a treasure capable of granting wishes, but in the process of defeating these guardians, the crew ends up releasing another evil. (aired after Episode 53)

Official synopsis from AniList.