[Question] Can someone please explain the One Piece world map?

[Legend Slayer]

Here's what I'm talking about , they enter the grand line through the red line , and when they see the red line again they only half way? That makes no sense to me. U_U

 

[Tomato God]

The red line wraps around the world too

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So the red line and the grand line cross twice.

 

[Skylar Knight]

I'm pretty sure the planet is round.

 

[Legend Slayer]

The red line wraps around the world too

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So the red line and the grand line cross twice.

Ah , this cleared my confusion ^^^^^