Hashima Island, commonly called Gunkanjima (meaning "Battleship Island) is one among 505 uninhabited islands in the Nagasaki Prefecture about 15 kilometers from Nagasaki itself. The island was populated from 1887 to 1974 as a coal mining facility. The island's most notable features are the abandoned concrete buildings and the sea wall surrounding it.

"Battleship Island" is an English translation of the Japanese nickname for Hashima Island, "Gunkan-jima". The island's nickname came from its apparent resemblance to a battleship, or "gunkan" (jima/shima meaning island) due to its high sea-walls. It also is known as the Ghost Island. It is known for its coal mines and their operation during the industrialization of Japan. Mitsubishi bought the island in 1890 and began the project, the aim of which was retrieving coal from the bottom of the sea. They built Japan's first large concrete building, a block of apartments in 1916 to accommodate their burgeoning ranks of workers, and to protect against typhoon destruction.

The island once had the densest population in the world and now stands to deserted, except for the ghosts of course.

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