Red Line

The Red Line is a long continent that stretches across the entired world, from North to South, along the equivalent of Earth's Prime Meridian. While the continent appears unpassable for any boat wishing to cross between the seas or to certain sections of the Grand Line, there are certain pass points which a ship can cross between the Blues: up and down the waterways across Reverse Mountain (typically used to enter the Grand Line by pirates), by gaining government permission from the holy government land of Marie Joie or by submerging into Fishman Island, which is placed around a hole that links directly between the first half of the Grand Line and the New World.