What is the Red Line in One Piece?

What tier will be destroying Red Line (One Piece) with one shot?

Red Line DESTROYED Theory - One Piece 984

If our people use One Piece style of maping that would our world map will be like : r/OnePiece

Engraved Map from the world of One Piece - BreakPoint Laser

Don't be caught on the Blue Sea with no wind in your sails! Easy to bundle or roll, this One Piece inspired cloth map is great for cosplay, display,

One Piece World Cloth Map Scroll - Inspired by One Piece

Will All Blue be discovered after destroying the Red Line? - Quora

CapCut_red line one piece

EXPLAINING the One Piece World!, One Piece 101

Discussion - The Inherited Will