Grand Line

The Grand Line is an ocean current approximately located around the entire equator of the world, south of the North and East Blues and north of the South and West Blues. It is separated from the Blues on both the north and south ends by the Calm Belt. The Grand Line is split into two sections by the Red Line: the first section is known as Paradise and the second is known as the New World.

Reputed as the "pirate's graveyard," the sea and the islands possess a vast number of unpredictable phenomena that are not seen anywhere else in the world, many of which make sailing extremely difficult. Additionally, the Grand Line is home to the world's most powerful people and groups, including the Three Great Powers. Only one group, the Roger Pirates, has managed to fully sail across the Grand Line, and this achievement is what caused their captain Gol D. Roger to be labeled as the "Pirate King".

The Grand Line serves as the setting of most of the series, with almost everything since the Alabasta Saga being set in it.

Overview
Yes... The Grand Line... I've seen pirates who've managed to make it back from that voyage... They're broken men, almost zombies! You can tell just by looking at 'em... Whether pirates or monsters... They've seen terrible things. None will speak of it... But the sight of em's proof enough... The Grand Line is a place of horror!

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 from north-east to south-west. These two lines divide the rest of the Blue Sea into the Blues: North Blue, East Blue, West Blue, and South Blue.

This stretch of ocean is said to be the most dangerous place in the world, and is commonly referred to as the Pirates' Graveyard by people from the four Blues 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. The Grand Line is placed similarly to the equator. In fact the main importance of the Grand Line is that it is the only way to circumnavigate the globe. The Grand Line along with the Red Line are what separate the 4 Blues and as such are key to worldwide trade and travel in that the Lines are placed along the paths 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 are either uninhabited or the citizens have taken precaution to the threat.

Calm Belt


To the north and south of the Grand Line are strips of ocean known as the "Calm Belts". Where 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 (making it difficult to cross without propulsion). Extremely large sea monsters called Sea Kings dominate 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 Mary Geoise. 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 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 Four Emperors reside, each holding their own respective territory.

Climate
On the Grand Line, you can't trust the wind, the sky, the waves, or even the clouds. Everything is treacherous. The only thing you can count on is the Log Pose!



The weather is unusual on the Grand Line to say the least, the standard rules of meteorology don’t apply. The ocean currents and weather patterns are extremely volatile and inconsistent, they can drastically change in an instant; this includes water spouts, storms, blizzards, heat waves, thick fog, and many other such things. There are also cyclones that seem to appear quickly and suddenly, they are remarked as being impossible to predict.

The reason for these erratic currents and weather is because the islands on the Grand Line each have a distinct climate year round, most often falling into one of four basic categories: Summer, Spring, Autumn, and Winter. These types of islands each have four seasons of their own, ranging from Summer Island summer to Winter Island winter, giving the Grand Line a total of 16 different seasons. That’s not including islands with climates that differ from the basic four. It is the clashing weather patterns and magnetic waves generated from each island that causes the strange and unpredictable conditions on the open seas between islands.

Notably, the first leg of the Grand Line is especially chaotic. There are seven different paths that one can choose from to sail through. The clashing weather and magnetism of those first seven islands cause insane sailing conditions that are beyond nearly anything else in the first half of the Grand Line.

The only areas where the weather and currents are stabilized and predictable are the Islands and their nearby surrounding waters. This doesn’t mean the weather will be calm and sunny, it just means that the climate won’t suddenly swift as it does on the open ocean.

Navigation


A normal compass wont work on the Grand Line due to each island generating its own magnetic field. In order to navigate the Grand Line, one needs a special type of compass known as a Log Pose.

The Log Pose works by locking on to the magnetism produced by one island and points toward that island. After reaching said island and staying there for a certain amount of time, the Log Pose will reset and start locking on to the magnetism of the next island. The time it takes for a Log Pose to set is different on each island; it may take a few hours, it may take a few days, or even a full year.

A Log Pose for the first half of the Grand Line has only a single needle. Alternatively, a Log Pose for the second half has three needles. Each of the three needles locks on to the magnetic waves of one of three different islands. This is because islands in the New World tend to experience changes in their magnetism. Therefore, if you lose the magnetism of one island, you still have two backup options. Furthermore, changes in magnetism can be caused by abnormalities on the island, the unstable magnetism of the island resulting in the corresponding needle jiggling. The trick is to follow the needle that is most stable.

There is another type of Log Pose known as an Eternal Pose. This version of the Log Pose is permanently locked on to the magnetism of a specific island and never resets. This makes it easier for a crew to get to a specific island, rather than following a regular Log Pose through a trail of islands.

At the entrance of the Grand Line, there are a total seven different islands that a Log Pose can lock on to. Each one being the beginning of one of seven different routes that on can travel across through the first half of the Grand Line. The seven routes diverge from Reverse Mountain and travel east before reconverging at the Saboady Archipelago.

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

 * Cactus Island (Log change: less than a day)
 * Whisky 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
 * The Florian Triangle Area
 * Sabaody Archipelago
 * Guanhao
 * Tarai Current
 * Marineford (former)
 * G-1
 * Karakuri Island
 * Momoiro Island
 * Boin Archipelago
 * Namakura Island
 * Kuraigana Island
 * Kenzan Island
 * Merveille
 * Foolshout Island
 * Vira

Red Line

 * Reverse Mountain
 * Twin Cape
 * Mary Geoise (Above)
 * Fish-Man Island (Below) (Log change: Half a day)
 * Ryugu Palace
 * Mermaid Cove
 * Coral Hill
 * Gyoverly Hills
 * Gyoncorde Plaza
 * Sea Forest
 * Red Port

New World

 * Laugh Tale
 * Lodestar Island
 * Yukiryu Island
 * Wano Country
 * Foodvalten
 * Edd War
 * G-5 Marine Base
 * G-1 (former)
 * New Marineford
 * Dressrosa
 * Acacia
 * Sebio
 * Primula
 * Carta
 * Flower Field
 * Corrida Colosseum
 * Green Bit
 * Totto Land
 * Whole Cake Island
 * Whole Cake Chateau
 * 100% Island
 * Biscuits Island
 * Black Island
 * Cacao Island
 * Candy Island
 * Cheese Island
 * Cutlery Island
 * Flavor Island
 * Fruits Island
 * Funwari Island
 * Futoru Island
 * Ice Island
 * Jam Island
 * Jelly Island
 * Kibo Island
 * Kimi Island
 * Kinko Island
 * Komugi Island
 * Liqueur Island
 * Loving Island
 * Margarine Island
 * Milenge Island
 * Noko Island
 * Nuts Island
 * Package Island
 * Piepie Island
 * Poripori Island
 * Potato Island
 * Rokumitsu Island
 * Sanshoku Island
 * Tanega Island
 * Topping Island
 * Unique Island
 * Yakigashi Island
 * Risky Red Island
 * Mystoria Island
 * Raijin Island
 * Punk Hazard
 * Zou
 * Prodence Kingdom
 * Mogaro Kingdom
 * Doerena Kingdom
 * Majiatsuka Kingdom
 * Applenine Island
 * Karai Bari Island
 * Broc Coli Island
 * Germa Kingdom (currently)
 * Elbaf
 * Hachinosu

Exact Location Unknown

 * Baltigo
 * Bourgeois Kingdom
 * Standing Kingdom
 * Birka

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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