Mary Geoise, also known as the Holy Land, is the capital of the World Government within the One Piece world. Officially, crossing between the Grand Line and the New World via this path is located at the top of the Red Line, facing Reverse Mountain. Therefore, this elevated city at the top represents not just a geographical location but a symbol of authority in the One Piece world.
The roots of Mary Geoise are inextricably linked to the mysterious Void Century, a period of one hundred years in the history of the world that remains a blank. According to the timeline, it was founded approximately 800 years ago, right at the tail end of the Void Century. By inference, there must be a strong connection between the creation of Mary Geoise and the major events that changed the order of the world in One Piece's ancient history.
Mary Geoise serves as a haven for the world's elite—the Celestial Dragons, otherwise known as World Nobles. These individuals are direct descendants of the kings who founded the world and are above the law, displaying overt pride and cruelty. Mary Geoise shelters the Celestial Dragons, making it the pinnacle of the social hierarchy in the One Piece world.
One of the most intriguing aspects of Mary Geoise is the existence of a mysterious "National Treasure." The details of what this might be remain unknown, but it is speculated that it is something so important that it could change the entire world if exposed. This mystery adds to the enigmatic nature of Mary Geoise, suggesting that the city holds keys to understanding the broader mysteries of the One Piece world.
The leadership structure of Mary Geoise is equally mysterious. At the helm of this hierarchy is a single being: Im. The revelation of Im was a monumental moment in the series, hinting at a deeper level of control within the World Government than previously imagined.
The architecture of Mary Geoise is grand and ornate, reflecting the dignity and stature of its inhabitants. The city is composed of large, decorative buildings and is safeguarded by the best security measures in the world, including CP0, the World Government's finest intel agency.
Some fan theories suggest a more complex history for Mary Geoise. One such theory posits that Mary Geoise is situated on the site that was once the Ancient Kingdom—a powerful civilization from the Void Century. If true, this would add a layer of irony to the current status of the city as the seat of the World Government.
Mary Geoise is central to many of the major events in the One Piece story. It has hosted several important meetings, such as the Reverie, a congress of world rulers held every four years. These meetings often lead to decisions that have far-reaching consequences throughout the One Piece world.
Mary Geoise houses a multitude of powerful and mysterious entities, including the Celestial Dragons, Im, and the Gorosei, the five elders who are the highest authorities within the World Government. With all these figures, Mary Geoise serves as the seat of political power and intrigue in the series.
Recent developments in the manga have hinted at even more secrets within Mary Geoise. Discoveries of ancient technology and the possibility of connections to long-lost civilizations further emphasize the mystery of this place.