One Piece Chapter 841 – The Germa Kingdom scaling the Red Line

The World Map of One Piece

ONE PIECE MAP: RED LINE, GRAND LINE, EAST BLUE by Mugiwara

One Piece 1089 Spoilers: Are the disasters around the world caused by Imu Sama? - Spiel Anime

EXPLAINING The Origin of The RED LINE in One piece

World of One Piece: Grand Line and Red Line – Gitopia – This Otaku Life of Mine

One Piece: Summit War (385-516) (English Dub) Halfway Across the Grand Line! Arrival at the Red Line! - Watch on Crunchyroll

How One Piece will end

User blog:Mr. Bambu/One Piece Calc: I'm Prepared for Death., VS Battles Wiki

Theory - Plothole or someone should explain me..

The One Piece World Explained: Grand Line, Red Line & More