The Kingdom of Nibana (ニバーナ王国 Nibāna Ōkoku) is a kingdom in the south part of Radaxian ruled by High Stone. Its relationship with the Kingdom of Radaxian is unknown. This is the 14th stage in Alex Kidd in Miracle World, and also the shortest stage in the game.
In the Radaxian Castle, Egle tells Alex Kidd that there is a letter to High Stone in the castle and that he has the Moonlight Stone Medallion. If Alex brings the letter, High Stone laments that he no longer has the stone. Without the letter, High Stone will threaten Alex and a ghost appears, forcing him to leave.