Kogyoku Village ( コーギョク村, Kōgyoku-mura ?, English version: "Ruby Village") is a village located on the northwest side of the island, directly south of the Prison Tower and northwest of Hisui Bridge. However, they are no longer able to mine from Ogyoku Mine due to the Marines taking control of it and barring access, which has created tensions among them. Nestled right against Ogyoku Mine to the south, its population consists heavily of miners. Ogyoku Mine Town ( オーギョク鉱山町, Ōgyoku Kōzan-chō ?, English version: "Topaz Mine Town") is a town located northeast of Sogyoku Town. The only civilians that live there are Omusubi and her children, with Omusubi working as a lunch vendor for the Marines. The Marines stationed on the island currently make up most of its population, with their occupation causing the vast majority of civilians to move elsewhere. Suigyoku Town ( スイギョク町, Suigyoku-chō ?, English version: "Emerald Town") is the farthest-north town on the island, being located directly northwest of Konko Plaza and northeast of Hisui Bridge. However, there is also a small Marine base directly adjacent to the east. The town also has a large Anti-Navy population, with the faction's leader Jeanne living in the church there. Given its proximity to the pirate-infested harbor, it is frequently a target for pirates. Sogyoku Town ( ソーギョク町, Sōgyoku-chō ?, English version: "Sapphire Town") is a town located to the west of the island, directly north of Kohaku Harbor.
Due to the town's population and its close proximity to many locations, particularly Marine-controlled areas, it is often the best place to find and collect information. Notable areas within the city include the downtown area which features an open-air marketplace, as well as the "slums" directly west of the Marine base which criminals and Anti-Navy faction members can be found in. Steel City possesses uniquely tall skyscrapers and colorful electronic images. The main Marine base of the island is located directly adjacent to the city off to the east, while a bridge connects the city to the Sea Prison from the southeast. It is located on the east coast of the island near the center, being bordered by Halcum Port to the north and Suisho Canyon to the south. Steel City ( スチール街, Suchīru-machi ?) is the largest and most populous settlement on Jail Island. Moreover there are three prisons, built up by new Warden Isaac, and several Marine Bases. It is divided in five zones, each of them with at least one main city. It is stated to be rich in natural resources. Jail Island is a lush, green island with multiple elevated surfaces and precious stone formations.