The first half of the Grand Line is known as Paradise ( 楽園（パラダイス）, Paradaisu ?). The second half, which starts beyond the second Red Line point to the backside of Reverse Mountain, is known as the 'New World'. The first half, stretching from Reverse Mountain to the polar opposite point of the Red Line, is known as 'Paradise'. The Grand Line is divided by the Red Line into two halves. However, there are also several islands, or portions of the islands, which are considered dangerous in their own right, and thus, they are either uninhabited or the citizens have taken precaution to the threat. This indicates that it is actually traveling within the Line itself that is dangerous, as it virtually guarantees facing unpredictable climates and dangerous wildlife. Despite the reputation of the Grand Line being dangerous and chaotic, many normal people manage a living on individual islands regardless, having adapted to their home land. This stretch of ocean is said to be the most dangerous place in the world, and is commonly referred to as the Pirates' Graveyard ( 海賊の墓場, Kaizoku no Hakaba ?) by people from the Four Blues due to the presence of the Three Great Powers over it.

This makes them valuable routes of travel and obstacles for both pirates and civilians alike. As such, they are key to worldwide trade and travel in that the Lines are placed along the paths between the Blues. The Grand Line and the Red Line crossing each other is what divides the rest of the Blue Sea into four oceans : the North Blue, the East Blue, the West Blue, and the South Blue. The main importance of the Grand Line is that it is the only way to circumnavigate the globe. It follows an imaginary line that runs from north-west to south-east across the middle of the world and perpendicular to the Red Line, a vast ring-like continent that circles the globe from north-east to south-west. The Grand Line is the gigantic sea route that circles around the planet, stretching from west to east. They're broken men, almost zombies! You can tell just by looking at 'em. I've seen pirates who've managed to make it back from that voyage. The Grand Line serves as the setting of most of the series, with almost everything since the Arabasta Saga being set in it. Roger to be labeled as the 'Pirate King'. Only one group, the Roger Pirates, has managed to fully sail across the Grand Line, and this achievement is what caused their captain Gol D. Additionally, the Grand Line is home to the world's most powerful people and groups, including the Three Great Powers.

Reputed as the 'pirate's graveyard,' the sea and the islands possess a vast number of unpredictable phenomena that are not seen anywhere else in the world, many of which make sailing extremely difficult. The Grand Line is split into two sections by the Red Line: the first section is known as Paradise and the second is known as the New World.

It is separated from the Blues on both the north and south ends by the Calm Belt. The Grand Line is an ocean route which wraps around the entire world, south of the North and East Blues and north of the South and West Blues.

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