Welcome to the world of Jomali. Jomali is covered by two vast oceans, which are divided by a massive mountain range called the Red Line, which is also the only continent in the world. The Grand Line, a sea that runs perpendicular to the Red Line, further divides them into four seas: North Blue, East Blue, West Blue, and South Blue. Surrounding the Grand Line are two regions called Calm Belts, similar to horse latitudes, which experience almost no wind and ocean currents .

The world is ruled by the Celestial Dragons, where the supreme head of the Celestial Dragons is Yasonari Vinsmoke. The Celestial Dragons have implemented into power a naval fleet know as The Son’s of Poseidon to ensure the security and safety of the world. After The Son’s of Poseidon killed the Pirate King “Gold” Roger, “Gold” Roger proclaimed that anyone can have his treasure and claim the title of pirate king if they could find it. This started a great pirate era where many set sail to claim the treasure of “Gold” Roger.