From the Super Mario Wiki
Sparkle Land is the fourth and final world in Wario World. It is desert-themed area located behind a temple-like portal. The first level, Mirror Mansion, can be accessed by entering a tower resembling an upside-down top hat. Ribbon stairs take Wario to a pyramid where the second level, Pecan Sands takes place.
The world contains a shipwreck, giant barrels and yellow stars lying on the sand. Around the ship there is a small amount of water. The last major boss before Black Jewel, Captain Skull is fought in Sparkle Land.