G-8 is a non-canon Marine branch spread across Navarone Island, sealed behind a single gated cape that makes escape nearly impossible. Bristling with cannons yet strangely calm, it becomes the trap the Straw Hats must break out of during the anime's G-8 Arc.
G-8 sits on Navarone Island in Paradise and carries the formal designation Marine Grand Line Eighth Branch. Structures dot the shoreline, but the most crucial ones are hewn straight into a rock mass rising at the middle of the cape. One massive gate closes off the sole route in or out, while the bay conceals dangers such as Devils Snare, a cliff-ridden zone able to snare vessels once the tide drops. A crossing named the Straw Bridge links the shore to the inner complex. This location serves as the main backdrop of the anime-exclusive G-8 Arc.
Firepower defines the branch, its central base alone mounting 108 cannons, which places it among the most heavily guarded Marine posts anywhere. For all that weaponry, genuine trouble almost never comes; the peace runs so deep that the garrison's four leading regulations concern cleaning one's plate at meals.
The soldiers posted to this island guard their pride in it jealously and snap at anyone who belittles its worth. Idle peacetime has bred oddities, among them a patrol cadence that brags on the base's strength, sung to a well-known military melody but delivered at an unhurried marching gait because Navarone is so quiet. Once the Straw Hats wash ashore and set about reclaiming their seized gold to slip away, the garrison scrambles to catch them, turning the stronghold into a drawn-out chase. The label G-8 doubles as wordplay on gate, a nod to the cape's single opening.
Vice Admiral Jonathan runs the base, backed by Lieutenant Commander Drake. Its roster shows just how domestic the posting feels, mixing combat squads with a broad support staff. Fighting units include the Hot Wind Marines of Unit 55 and a dedicated Sword Unit, plus an unnamed Chief Petty Officer and assorted non-commissioned officers heading patrols.
A large share of the personnel keep the kitchens and grounds running. Jessica presides as head chef over a green-ascotted sous chef and cooks such as Shinpachi, Billy, and Tom, while the Marley Brothers pull double duty at the dishwashing station. The staff also counts the mechanic Mekao, the pediatrician Kobato standing in as medical room chief, and a bearded head custodian who, when Nami slipped on an apron as a disguise, took her for one of the cleaning staff.

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G-8, formally the Marine Grand Line Eighth Branch, is a non-canon Marine base located on Navarone Island in Paradise. It serves as the setting of the anime-exclusive G-8 Arc, where the Straw Hat Pirates must break out from behind its single guarded gate.
The G-8 Arc is a non-canon, anime-only story that does not affect the main One Piece plot, so it can be skipped without losing continuity. It does offer a lighthearted chase as the Straw Hats try to escape the heavily armed but oddly peaceful Marine base.
No, G-8 is non-canon. It appears only in the anime's G-8 Arc and is not part of Eiichiro Oda's original manga story.
The G-8 storyline first appears at Episode 195 of the anime, introducing the heavily fortified but oddly peaceful Marine base on Navarone Island.
G-8's central base is armed with 108 cannons, making it one of the most heavily fortified Marine posts in One Piece, even though genuine danger rarely reaches the island.
Looking for more on G-8? The One Piece Wiki on Fandom has a dedicated page with community notes.
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