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.
- 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.