The world of One Piece is a planet with similarities to Earth, having oceans and landmasses, but differs by being divided by two unique factors: the Red Line, which is an incredibly tall strip of land that divides the planet in half, and the Grand Line, which is a long ring of ocean that intersects with the Red Line perpendicularly. This divides the planet into 4 unique oceans that make up the Blue Sea, those being the North Blue, the East Blue, the West Blue, and the South Blue.
The planet's name is currently unknown.
The map above will direct you to the various pages for the different oceans and landmasses, there you will find more comprehensive pages on the various areas as well as more accurate lists of islands and locations including unnamed islands.
For island locations that are unknown or yet to be confirmed, click >here<