Peak Ode Island

Peak Ode Island is a non-canon island in the New World and former territory of the Whitebeard Pirates.

Geography
Peak Ode Island is a circular island, with a mountain range around its border. Part of the island is open to the sea, causing the island to appear like a fighting ring. During Whitebeard and Ace's fight, the top of the mountain range was destroyed.

Citizens
The island is uninhabited, allowing the Whitebeard Pirates to use the island for destructive activities.

Episode A
Peak Ode Island was the location of the 100th duel between Whitebeard and Ace. The duel damaged the island, destroying the entire top half of its mountain range.

Due to it being the location of their last duel, it's also the location where Ace officially agreed to join the Whitebeard Pirates, though his welcome ceremony occurred on another island.