The World of One Piece
One Piece takes place in a fictional world almost completely covered by the ocean, which is separated into four parts: North Blue, East Blue, South Blue, and West Blue. There are numerous islands on each sea, where the majority of the world's population lives in communities ranging from small villages to large cities. The four seas are separated by the only continent, known as the Red Line, and the most dangerous sea, known as the Grand Line. The Red Line and the Grand Line both span the entire circumference of the world, the Red Line runs in a north/south direction whereas the Grand Line runs in an east/west direction. Two eternally peaceful seas, known as the Calm Belts, flank the Grand Line to the north and south, separating it from the four Blues. Sailing by normal means is possible anywhere except in the Grand Line.
However, in the Calm Belts, the weather is eternally peaceful, meaning that ships that rely on wind for movement will not be able to move very fast, if at all. Also, the Calm Belts are a nest for sea kings, gigantic sea monsters that are difficult to deal with when alone, and virtually impossible to fight when against a group. In the Grand Line, each island has its own magnetic field surrounding it, causing a compass to become completely ineffective. Instead, a Log Post must be used to lock onto the magnetic field of the next island and sail there using the Log Post. Once at the island, a certain period of time, spanning from a few hours to years, is required for the Log Post to lock onto the magnetic field of the next island, and the process continues throughout the Grand Line. Although there are various routes through the Grand Line, ultimately all of them will lead to the final island at the very end of Grand Line, Raftel.
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