One Piece

The Calm Belts are vast, eerie stretches of ocean devoid of any wind or current, creating a seemingly peaceful but treacherous barrier for ships attempting to navigate the Grand Line. Nestled within these tranquil waters are the nesting grounds of the formidable Sea Kings, whose massive forms occasionally breach the surface, exuding an aura of menace that warns away all but the most powerful vessels. The only safe passage between the Blues and the Grand Line is over the perilous Reverse Mountain, a daunting task for even the bravest pirates.

A panoramic view of a serene, mirror-like ocean, with a faint, ominous ripple indicating the presence of colossal Sea Kings lurking beneath, surrounded by an endless horizon under a shrouded sky.