Corona Mountain

Corona Mountain is the final area Mario and FLUDD visit in Super Mario Sunshine. The path to this area is opened after Mario and FLUDD complete all of the game's Shadow Mario levels. Corona Mountain is where the final showdown against Bowser and Bowser Jr. takes place. The volcano contains an area where Mario must jump across timed spiked platforms and an area where the plumber must steer a boat to the other side of a sea of lava. Falling into the lava results in instant death. If the boat collides with anything, it will sink into the lava. Surprisingly, although the boat is made of mud, no harm will come to it if you avoid obstacles. Unlike the other areas, Corona Mountain does not have episodes and is merely an obstacle course, followed by the final battle.

Trivia

 * In Italian and Spanish, Corona means Crown, essentially making this place "Crown Mountain." Also, the "corona" is the plasma atmosphere that surrounds the sun. That being said, it is very hot (hotter than the surface of the sun), making it possible that the extremely hot Corona Mountain is additionally (or perhaps instead) named after this corona, however the mountain is located on the "head" of the dolphin shaped island.
 * This volcano seems to be inactive.
 * If the player looks at the paths and platforms, he/she can see that there may have been a hallway along the level.
 * There is an enemy attack in Super Mario RPG called Corona.