Neverland

Neverland is the world of Peter Pan.

Kingdom Hearts
In the first game of the series, Neverland is seen as early as Monstro. After the events inside the whale's insides, Riku returns Kairi's lifeless body to Captain Hook's ship. Maleficent meets him there, and gives him the ability to control the Heartless. Neverland does not appear again until Sora and company are captured by Captain Hook. After meeting Peter Pan, they scurry through the ship, eventually fighting off Anti-Sora. Riku escapes with Kairi, leaving Captain Hook to fight Sora. Peter Pan leaves after retrieving his friend, Wendy, but returns right before the fight against Captain Hook. Captain Hook is thrown overboard by Sora and Peter Pan, where he is chased to the horizon by the Crocodile. Peter Pan, with the help of his pixie friend Tinker Bell, take Sora to the Clock Tower, where Wendy is waiting. Sora repairs one of the clock faces, which reveals the Neverland Keyhole. Sora seals it with his Keyblade, and bids farewell to Peter. Neverland is not present in Kingdom Hearts II.

Kingdom Hearts: Chain of Memories
Neverland does not make an appearance on Kingdom Hearts: Chain of Memories since the main story is focused on Captain Hook's pirate ship.

Trivia

 * Although it is called Neverland, you cannot reach the island Neverland, where Peter Pan lives on. Instead, the world's maps consist of Hook's ship and London's Big Ben clocktower. However, you can see a small, green island near the ship in the bottom of the world's overview, with the Clocktower and a small cityscape of London on top.

Keyblade
The Fairy Harp Keyblade can be acquired, which happens to be the feather on Peter Pan's hat.