The East Blue is an ocean in the Blue Sea and was the setting of the first six arcs of the manga and anime and the anime-onlyWarship Island arc. The East Blue, like its sister seas, comprises almost entirely of ocean, with scattered islands and a border with the Red Line. It is also referred to as the Sea of Schemes.
The East Blue is commonly known as the weakest of all the seas. Pirates who are considered great and threatening in this sea are regarded as low rate compared to pirates from the other seas and especially in the Grand Line. Ironically, despite its poor fame, the East Blue was the birthplace of the most powerful pirate of all time, the late Pirate KingGol D. Roger.
Warship Island≠: an island set before the Grand Line, called such as the mountain formation looks like a warship from a distance. It is originally a dragon's nest that rises from the ocean once every thousand years.
Lost Island≠: an island that rises above water once every 1000 years. It was the homeland of Sennenryu.
Gold Island≠: the island where Woonan lived and died. Woonan was famed to have hidden all of his treasures there but in fact he returned all the gold he stole to its original owners before passing away.
Clockwork Island≠: a small island with a very big tower in the center that supports a big city.
700 years ago, the Celestial Dragons ordered the construction of a bridge for currently unknown reasons. The work force consisted of slaves, prisoners, and residents of countries not affiliated with the World Government. The unfinished bridge eventually became as large as a country.
After saving a certain village from a group of bandits, Kozaburo settled down and started a family, fathering a son, Koushirou, who would then have a child of his own, Kuina. The village would be named on his honor, being christened as Shimotsuki Village. Kozaburo is seemingly still alive to this day as one of the village's eldest members.
Loguetown, the city in the East Blue located closest to the Grand Line, was the birthplace of the late Pirate King, Gol D. Roger. Twenty four years ago, it also became the place where he was executed, and it was the words spoken by Roger just before his death that set off the Great Age of Pirates.
It became a stopping place for pirates heading towards the Grand Line, as a nearby Lighthouse lit up the route towards Reverse Mountain, the entrance of the Grand Line. This ended when CaptainSmoker was placed in charge of the town's Marines, though it could very well have started once again immediately after Smoker left his post in his attempt to capture Straw Hat Luffy.
Thirteen years ago, Germa 66 accepted a contract to invade and defeat the island of Cozia in the East Blue. As the Kingdom crossed over the Red Line from North Blue into the East Blue, Reiju freed Sanji from his cell and helped her younger brother escape the Kingdom. While Judge caught Sanji trying to flee, Judge allowed Sanji to leave on the condition that Sanji never associate himself with the Vinsmoke name ever again. With Reiju's help, Sanji successfully made his escape on board a cruise ship docked on Cozia's coast.
Twelve years ago, in order to pass inspection by the World Government in preparation for the arrival of a World Noble, the royal family of the Goa Kingdom planned to burn the Gray Terminal and all its inhabitants. With the false promise of nobility, they hired the Bluejam Pirates to place gunpowder and oil around the Terminal. With their task complete, the pirates set the Gray Terminal on fire, shooting anyone fortunate enough to escape, but were left to die as the king locked the gates with them still trapped in the inferno. However, thanks to the assistance of Dragon and the Revolutionary Army, many inhabitants were able to escape to the safety of their ship. Bluejam was confronted and defeated by Portgas D. Ace and Curly Dadan, presumably perishing in the fire. This incident also led Sabo to leave Goa in a small boat, only to be shot down by Saint Jalmack near the kingdom's coast.
After the inspection was over and Saint Jalmack departed, the kingdom returned to its old ways and the Gray Terminal returned to being a dump site for garbage. It is unknown if the place was inhabited again or if it is still deserted.
However, their plans did not come to fruition as Monkey D. Luffy and his crew managed to defeat Arlong and his top henchmen, thus freeing the Conomi Islands from the clutches of the Arlong Pirates. This incident led to Luffy's first ever bounty of 30,000,000, which made him East Blue's most wanted man at the time.
The East Blue is generally considered the weakest of the seas, because the average bounty for the East Blue is set at only 3,000,000. Any bounty that reaches over 10,000,000 is considered impressive.
The most dangerous known pirate (until Luffy came along) was the fish-man Arlong with a bounty of 20,000,000 (though this was due to his actions being hidden by bribery).
The biggest pirate fleet in the East Blue was that of Pirate Admiral Don Krieg.
A notorious pirate back from the Roger era, Shiki the Golden Lion, held a grudge towards this particular sea. He deemed it the weakest of the Four Blues; however the man who managed to defeat him, Roger, came from there, and also met his end there, preventing Shiki from killing Roger himself.