- Po City is a fictional city that appears in the anime and manga series "One Piece." It is located on the Sabaody Archipelago, an archipelago in the Grand Line. Po City is known for its bustling and vibrant atmosphere, with numerous shops, restaurants, and entertainment venues. It is a popular destination for pirates and other adventurers making their way through the Grand Line. The city is also home to a famous auction house, where rare and valuable items are bought and sold. Despite its lively appearance, Po City also has a darker side, with underground criminal activities and a high presence of slave traders. Overall, Po City serves as an important location in the "One Piece" series and has played a significant role in several story arcs.