The Sealed Cave is a location in Final Fantasy III. Located in the Sasune area, it lies beyond a lake and surrounded by water, to prevent any access except by canoe or airship. The undead inhabit this area, and Djinn resides here as well.
The party visits the cave to rescue Princess Sara and to fight the Djinn to remove his curse, which has turned the people of the nearby town of Kazus and Castle Sasune into ghosts. Halfway through the cave, they find the princess, who aids and follows them through the rest of the dungeon. At the bottom of the cave, they meet the Djinn, and defeat him, returning to Castle Sasune afterwards.
The background music that plays inside the Sealed Cave is the "Dungeons" track.
Princess Sara had not been kidnapped: she set out for the Sealed Cave on her own to banish the Djinn with the mythril ring. The Warriors of Light join her as she attempts to put an end to the Djinn's curse.