Koopabiza

Koopabiza is an island on the Mushroom World, appearing only in the Club Nintendo comic "Super Mario: Erholung? Nein, danke!". In this story, Mario, Princess Peach, Yoshi and Luigi take a vacation to Koopabiza. It seems to be a typical tourist location, however, Mario and his friends are deeply disappointed about their holiday. The only known place on Koopabiza is the Gumba Royal Hotel. Bowser and Morton Koopa Jr. work on the island.

Trivia

 * The name Koopabiza is a pun on Koopa and Ibiza, a popular tourist destination on Earth.
 * Koopabiza seems to be popular especially among Mario's enemies (hence the name), as besides Bowser and Morton Koopa Jr., Wario, Koopa Troopas, Goombas, Lemmy Koopa, Wendy O. Koopa and Sumo Bros. can be seen in the comic.