Grand Line

The Grand Line is an ocean where the majority of the plot takes place in One Piece.

Overview
The Grand Line is the ocean current that is surrounded by the Calm Belts and follows an imaginary line that runs from north-west to south-east across the middle of the world and perpendicular to the Red Line. The Red Line is a vast continent that circles the globe the rest of the Blue Sea into the Blues: North Blue, East Blue, West Blue, and South Blue.One Piece Manga and  - Vol. 6 Chapter 51 and Episode 3,  because of this reputation. Those few pirate crews that make it to the second half of the Grand Line, known as "the New World", refer to the first half as "Paradise", showing it is all relative. Most believe that it is impossible to safely leave the Grand Line save at its beginning and end. However, the World Government regularly sends ships across the Calm Belts by coating their hulls with Seastone, rendering them invisible to the Sea Kings.'what seperate the 4 Blues and as such are key to worldwide trade and travel in that the Lines are placed along the pathes between the Blues. This makes them valuable routes of travel and obstacles for both pirates and civilians.

Despite the reputation of the Grand Line being dangerous and chaotic, many normal people manage a living on individual islands regardless, having adapted to their home land. This indicates that it is actually traveling within the Line itself that is dangerous, as it virtually guarantees facing unpredictable climates and dangerous wildlife. However, there are also several islands, or portions of the islands, which are considered dangerous in their own right, and thus, they SUCK. GET A LIFE WEEABOOS.

Calm Belt
To the north and south of the Grand Line are strips of ocean known as the "Calm Belts". The true entrance to Grand Line is usually marred by storms; the waters of the Calm Belts remain static year round, and there are virtually no winds or waves (this makes it difficult to cross without propulsion). Extremely large sea monsters called Sea Kings live in the Calm Belts; in fact, the monsters found in the Calm Belts are the largest shown thus far in all of One Piece. The combination of no currents, no wind, and the presence of the Sea Kings makes these belts perfect barriers to any traveler trying to directly go into the Grand Line.

Without using Seastone-lined ships (which are concealed from the Sea Kings to a certain degree) and some propulsion, the Grand Line can only be accessed at two points on the Red Line: Reverse Mountain and the Holy Land of Mariejois. The first is where the four major currents of the Blues merge together to form the Grand Line, while the second is the site of the World Government.

Halves
The Grand Line is divided by the Red Line into two halves. The first half, stretching from Reverse Mountain to the polar opposite point of the Red Line, is known as "Paradise". The second half, which starts beyond the second Red Line point to the backside of Reverse Mountain, is known as the "New World".

Paradise
The first half of the Grand Line is known as Paradise (楽園（パラダイス）) to those who have been to the New World. It lies between East Blue and South Blue. While the Grand Line is a dangerous place, the first half is known as such in comparison to the more terrifying dangers present in the New World. This was first mentioned when Luffy remembered Zeff calling the Grand Line a paradise and another time when the pirates wanted to go back to Paradise in the New World.

New World
The New World (新世界) is the second half of the Grand Line. It lies between North Blue and West Blue. This half has not been fully explored, except by the Pirate King, Gol D. Roger, himself. This area is also where the Yonko reign.

Climate
The weather is unusual on the Grand Line. The currents and weather are extremely volatile, as they can change in an instant; this includes water spouts, storms, blizzards, and other such things. Islands and the surrounding waters are the only areas where weather and currents are stabilized in a predictable manner. The reason for this is that islands on the Grand Line fall into four basic categories: Winter, Spring, Summer, and Autumn. These types of islands each have four seasons of their own, giving the Grand Line a total of 16 different seasons. There are also cyclones that seem to appear quickly and suddenly. Although being remarked as unpredictable, Nami was able to sense it coming even in a fevered state.

Navigation
Normal compasses do not work on the Grand Line because of the nature of its magnetic fields. In order to navigate the Grand Line, a special compass called a 'Log Pose' must be used. The Log Pose works by locking on to one island's magnetic field and then locking on to another island's magnetic field. The Log Pose can do this for a total of seven different routes that diverge from Reverse Mountain and travel east before merging again to an island, which is not Raftel. The time for a pose to set depends on the island. One island may take from a few hours to a few days to set to the next island, while another can take a year to set. This process can be bypassed by obtaining an 'Eternal Pose'. This version of the Log Pose is permanently set to a specific island and can never change. This makes it easier for a crew to get to a specific island rather than going through a trail of islands.

As also noted at Water 7, small sea vessels such as caravels do not make it particularly far in the Grand Line and it was a surprise that the Going Merry had. Despite a crew's best efforts it is difficult to keep a ship in good condition and avoid getting it battered by the Grand Line's natural hazards. Only good quality ships with knowledgeable crews stand a chance of traversing it safely.

Paradise

 * Reverse Mountain
 * Cactus Island (Log change: less than a day)
 * Whiskey Peak
 * Little Garden (Prehistoric Island. Log change: 1 year)
 * Kyuka Island
 * Drum Island (Type: Winter Island)
 * Bighorn
 * Drum Rockies (a group of tall tower-like mountains)
 * Robelle
 * Nanimonai Island
 * Alabasta (Originally called "Sandy Island"; type: Summer Island):
 * Rainbase
 * Yuba
 * Erumalu
 * Nanohana
 * Katorea
 * Spiders Cafe
 * Alubarna
 * Jaya (Type: Spring island, Log change: 4 days)
 * Mock Town
 * Skypiea
 * White Sea
 * White-White Sea
 * Angel Island
 * Upper Yard
 * Milky Road
 * Long Ring Long Land
 * Sea Train Zone
 * Water 7 (Log change: 7 days)
 * Enies Lobby
 * San Faldo
 * Pucci
 * St. Poplar
 * Banaro Island
 * Baltigo
 * The Florian Triangle Area
 * Sabaody Archipelago
 * Tarai Current
 * Mariejois
 * Marineford
 * Fishman Island (Log change: Half a day)
 * Karakuri Island
 * Momoiro Island
 * Boin Archipelago
 * Namakura Island
 * Kuraigana Island
 * Kenzan Island
 * Merveille
 * Foolshout Island

New World

 * Raftel
 * Yukiryu Island
 * Wano Country
 * Foodvalten
 * Edd War
 * G-5 Marine Base
 * G-1 (former)
 * Dressrosa
 * Acacia
 * Sebio
 * Primula
 * Carta
 * Flower Field
 * Corrida Colosseum
 * Green Bit
 * Whole Cake Island
 * Risky Red Island
 * Mystoria Island
 * Raijin Island
 * Punk Hazard
 * Prodence Kingdom
 * Applenine Island
 * Zou
 * Karai Bari Island

Trivia

 * Most places in the Grand Line are known in the other oceans through the book "Brag Men", but are considered fairy tales to those who have never been there.

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