Isle Delfino

Isle Delfino is a tropical island which appears in the Mario franchise. It is a vacation resort consisting of several attractions, and its capital area is Delfino Plaza. Isle Delfino is primarily inhabited by Piantas and Nokis. Isle Delfino makes its first and most notable appearance in Super Mario Sunshine in which it is the main setting.

"Delfino" is the Italian word for "dolphin," which Isle Delfino is in the shape of. The dolphin shape of the island is a reference to "Project Dolphin," which was the Nintendo GameCube's code name in early stages of its development.

Super Mario Sunshine
In Super Mario Sunshine's intro, Mario, Princess Peach, and Toadsworth are on the Toad Express, traveling to Isle Delfino. As the plane approach the island, a welcome video starts playing on the in-flight screen. In it, a Pianta welcomes tourists to Isle Delfino, highlighting their quality resort facilities, an amusement park, and seafood. The Toad Express lands on the Delfino Airstrip, albeit slightly askew because of a massive multicolored Goop near the center of the runway. Delfino Airstrip is the first location that Mario visits on Isle Delfino, and is where he meets F.L.U.D.D., who allows him to clean the Goop and defeat the Gatekeeper within it. In doing so, Mario earns his first Shine Sprite, but the Isle Delfino Police suddenly come to arrest him.

In the following court trial, Mario is wrongfully charged with the crime of covering Isle Delfino in Goop and stealing all of the Shine Sprites, both of which were actually done by Shadow Mario. The Shine Sprites collectively belong at the Shine Gate, serving as a light source for Isle Delfino, especially Delfino Plaza, to prevent it from being covered in darkness. The result of the trial is that Mario is assigned to clean all of the Goop and retrieve all of the Shine Sprites, and is not allowed to leave the island unless he has done so.

At Pinna Park, it is revealed that Shadow Mario is Bowser Jr., who is specifically responsible for polluting Isle Delfino. Later on, when Mario defeats both Bowser Jr. and Bowser at Corona Mountain, he and the others enjoy the rest of their vacation at Isle Delfino. The end credits show photographs of Mario and the others doing various activities around Isle Delfino.