Keyblade Graveyard

The Keyblade Graveyard (キーブレード墓場) is a world which appears in Kingdom Hearts Birth by Sleep. It was first revealed in Kingdom Hearts II ' s secret ending, "The Gathering". In Kingdom Hearts II Final Mix, the Lingering Sentiment can be fought here after a series of side-quests.

Several scans from Kingdom Hearts Birth by Sleep show scenes from this area, including one of Terra confronting Master Xehanort and another of King Mickey protecting Ventus.

Setting
All that has been seen in this world is a deserted sand area. This could be because Keyblade Graveyard only consists of sand and nothing else. The area looks faintly like "The Great Maw" in the Radiant Garden. Some of the scenery appears to have battle scars left from the Keyblade War.

Somewhere on this world is a field covered in the Keyblades of the Keyblade Masters who fell during the Keyblade War. The open spaces in the Keyblades creates a crossroads.

Kingdom Hearts Birth by Sleep
Terra goes to the Keyblade Graveyard and meets up with with Aqua and Ven. Master Xehanort appears alongside Vanitas, and explains to them that this was the place were a great battle took place, the Keyblade War, also revealing his intentions to use the X-Blade to unlock Kingdom Hearts and unleash the secrets of the Keyblade War upon the worlds. An epic battle ensues, and after Master Xehanort freezes Ven and drops him off a cliff, and Vanitas knocks Aqua unconsious, Terra uses the darkness in his heart to fight Master Xehanort.

Terra defeats him, but this allows Master Xehanort to take over Terra's body, thus creating Xehanort. However, Terra's soul finds its way into his discarded armor, creating the Lingering Sentiment. The two fight, eventually ending with Terra winning. He knocks Xehanort unconsious, and a huge blast (created by the shattered X-Blade) teleports Xehanort to another world. Terra kneels down, and swears to Aqua and Ven that one day, he will end this conflict.

Trivia

 * The capital letters in the logo for the Keyblade Graveyard slightly resemble real Keyblades. The "K" bears resemblance to the teeth of the Earth Shaker, the "E" resembles the teeth of the Fresh Breeze, the "G" bears similarity to the guard of the Rain Fall, and the final "D" resembles the guard of the Kingdom Key complete with the keychain, albeit featuring Sora's Crown Pendant rather than the regular chain.