One Piece

A massive stone-and-coral fortress that serves as the main base of operations for Arlong and his crew. The architecture resembles fish, with intricate designs and vibrant colors, surrounded by water and heavily guarded by Fish-Men. Beneath its surface lies a network of prison cells and treasure vaults, while Nami's map room stands as a reminder of her forced servitude.

The fortress is built from large coral structures and stone, with fish-like motifs adorning the walls. The water surrounding it is teeming with marine life, and the air is filled with the salty scent of the sea.