Grand Line One Piece Wiki Fandom The Red Line is basically a group of islands connected together We know that it has it's own season islands, as explained by Nami The Red Line that crosses the Grand Line has its own Summer, Winter, Spring and Fall "islands" chapter 604 It is 10,000 meters deep, bears the world capital Mariejois, as stated by Hachi The Red Line bears the world capital, Mariejois, and is saidHas there ever been an official release of a world map or only maps of east blue, the grand line, and the new world? One piece world map red line