One Piece

The Red Line is a monumental, reddish-hued ring-like continent that encircles the world, serving as a formidable barrier between the different blues of the sea and the dual halves of the Grand Line. This vast formation looms over the ocean, its surface rugged and rocky, while its depth extends 10,000 meters down to the mysterious Fish-Man Island. The sheer height and unyielding nature of the Red Line make it an impassable fortress, with its numerous islands shifting between vibrant summers and serene winters, yet mostly devoid of sustained human habitation, except for the capital of Mary Geoise, which stands as the lone testament to civilization atop its crest.

A panoramic view of the colossal Red Line, showcasing a jagged rocky surface dripping with crimson minerals, surrounded by tumultuous blue waves crashing against its base under a gray, cloud-specked sky interspersed with bursts of sunlight.