Swallow Island is an island in North Blue. It is found on the south of Minion Island and Rubeck Island.  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. Aside from the references to the bird being named after, it also has alot of birds on the island. From rare to common birds, there are very dangerous carnivoric birds on this island including predators hunting humans.

It has a small marine base located below the swallow's beak despite the carnivoric predator birds. Marksmen are trained here because of the birds, as hitting birds midair is a hard task.