The island's distinct feature is its central mountain formation taking the shape of a swallow, which is covered with trees. The island is also shaped like the aforementioned bird, as seen in a map owned by Donquixote Rosinante.
Thirteen years ago, the island was to serve as a temporary base for the Donquixote Pirates when they plan to steal the Ope Ope no Mi from the pirates lead by Diez Barrels. However, the crew never landed on the island when they spotted the Marine ships lead by Vice Admiral Tsuru, who set up an ambush for the crew based on Rosinante's information.
After leaving the Donquixote Pirates, Trafalgar Law would take residence in this island. He met Bepo, Penguin and Shachi by defending the former from the latter two, who were bullying the Mink at the time. Law defeated both Shachi and Penguin, causing them and Bepo to become attracted to his strength. The three started following Law and eventually formed the Heart Pirates at some point.
- Swallow, along with its neighbouring islands Rubeck and Minion, derive their names from English ships that took part in the Battle of San Juan de Ulúa, in which Francis Drake (the namesake of X Drake) commanded the English fleet.
- ↑ 1.0 1.1 One Piece Manga — Vol. 77 Chapter 765 (p. 8-17), Rosinante makes preparations to take the Ope Ope no Mi.
- ↑ One Piece Manga — Vol. 77 Chapter 766 (p. 14-15), Doflamingo saw two Marine ships waiting, and decided not to dock there.
- ↑ SBS One Piece Manga — Vol. 84, The origin of the Heart Pirates revealed.