New World

The New World... A place where people who will begin the next generation gather!! He who conquers this sea will become the "Pirate King"!!!

-Coby on the "New World".

The New World　（新世界　Shinsekai) refers to the second half of the Grand Line. It hasn't been fully explored (save for Gold Roger), and it holds the location of the final island on the Grand Line, Raftel. It is also where the Yonkou, 4 of the strongest pirates in the One Piece world, reside.  The New World goes from Mariejois to the other side of Reverse Mountain. According to Gecko Moria, one will lose everything one cherishes in the New World, something he personally experienced. Also according to him, one shall face what he calls "The Ultimate Nightmare" there, hinting that it is a highly dangerous place.

Trivia
It's name is a reference to the Western Hemisphere (including North and South America and the Caribbean), nicknamed the "New World" during the European exploration in comparison to the "Old World" of the Eastern Hemisphere in the perspective of a Eurocentric world view.