North Blue

The North Blue is an ocean in the One Piece World. North Blue, like its sister seas, comprises almost entirely of ocean, with a few scattered islands and a border with the Red Line. To this date, the storyline has not said much about the North Blue. It is known to be the birthplace of the Straw Hat Pirates' chef, Sanji; the legendary explorer Montblanc Noland and his descendants; the Bellamy Pirates and the origins of three of the Eleven Supernovas: Trafalgar Law, Basil Hawkins, and X Drake. The goggles that Usopp bought in Loguetown are said to be a new model from the North Blue.

One of the most famous stories from the North Blue is the tale of Montblanc Noland, an explorer from Lvneel. Over 400 years ago, Noland left to explore the Grand Line, traveling many places from Vira to Jaya. Upon his return home, he told everyone about his journey to Jaya and seeing the City of Gold. The king heard about the City of Gold and asked Noland to take him. Noland tricked the king into going to Jaya only to find the City of Gold was not there. Upon his return, the king sentenced Noland to death and he was executed, his last words being "That's it! The City of Gold must have sunk into the sea!". This event was published, by the king, into a child's storybook, where parents would use it to teach their children not to lie, lest they end up like Montblanc Noland. People like Sanji, Bellamy and Sarkies, born in North Blue, have came to know this story when reading it as children. 33 years before the current time, the patriarch of the Donquixote Family, Donquixote Homing, rescinded from his position as a World Noble. He brought his wife and two sons Doflamingo and Rosinante to a country in North Blue, which has no ties with the World Government. When citizens found out that the Donquixote Family is no longer under diplomatic immunity, they hunted down the family in revenge against all the ill-deeds done onto their loved ones by World Nobles, leading to Homing's wife to die from malnutrition that came from the deplorable shack they were forced to live in.

For two years, the remaining three family members were tortured and persecuted, suffering from poverty and starvation, until Doflamingo awakened his Haoshoku Haki and knocked out the commoners. This feat earned him the loyalty of four children Vergo, Trebol, Diamante and Pica who see Doflamingo as their new king. The four would kill and destroy anything that displeases Doflamingo even the slightest, with many victims and towns suffering such fates. Doflamingo killed his father (which led Rosinante to wander away with a broken heart), and after failing to reenter Mariejois, he returned to North Blue, where he and his four friends built a new family to terrorize the quadrant of the sea before entering the New World. 16 years ago before the current time, the country known as Flevance was famous for its Amber Lead, a beautiful mineral that made the country to be wealthy, and is what earned the country the nickname "White City". However, a century before this business boomed, the World Government and royal family of Flevance discovered that the mineral was poisonous when exposed to air, but chose not to reveal it, in order to maintain the profitable resources. This led to the poison to accumulate in the citizens' bodies, and each succeeding generation of offspring have shorter lifespans than their predecessors. It was 16 years ago that the full effect of this "Amber Lead Syndrome" came into visible effects, where the lead poisoning is showing on the victims' bodies. Neighboring countries mistook this as a contagious disease, and quarantined the White City from the rest of the world, which led the country to retaliate, leading to its destruction, with only Trafalgar D. Water Law as the sole survivor, who joined the Donquixote Pirates to take revenge on the world who shunned his homeland. Although the World Government has allowed the royal family to escape selfishly as the rest of Flevance fell, the world remains vigilant of the Amber Lead Syndrome, incorrectly believing that it is transmitted by human contact, shown when every doctor in North Blue that Rosinante took Law to demonized the latter as a survivor who should be eradicated.