Mushroom World

Place
During the events of Super Mario Bros. 3, Mario and Luigi go to a land called the Mushroom World. The Mushroom World is ruled by seven Mushroom Kings and it contains seven lands as well. Grass Land, Desert Land, Water Land, Giant Land, Sky Land, Ice Land and Pipe Land are located here.

Planet
The Mushroom World is the planet composed of most of lands, kingdoms, and islands seen and mentioned throughout the Mario series. The Mushroom World should not be confused with the Mushroom Kingdom which is just one kingdom in a greater world. Additionally, the Mushroom World should not be confused with the Marioverse. The Mushroom World is a specific place while the Marioverse encompasses everything related to Mario. For example, the land of Subcon is not part of the Mushroom World, as it is a world that exists in dreams. However, Subcon is part of the Marioverse.

Additionally, the Mushroom World is orbited by two moons, both smaller than Earth's moon. The larger can be traversed in several "screens," and the smaller can be covered in a few seconds. Mario has visited both. In Paper Mario: The Thousand-Year Door, Mario was shot to the large moon to reach the X-Naut Fortress and the last Crystal Star. In Yoshi's Island, Yoshi and Baby Mario were kicked to the small moon, where they had to fight Raphael the Raven. The smaller one is extremely dense for its size, having gravity similar to the planet's. In addition, both apparently have atmospheres similar to the Mushroom World's.

Lands of the Mushroom World

 * The Mushroom Kingdom
 * The various lands of Super Mario Bros. 3, including Dark Land
 * The Beanbean Kingdom
 * Sarasaland
 * Mario Land
 * Isle Delfino
 * Jewelry Land
 * Waffle Kingdom
 * Rogueport
 * DK Island (inferred)
 * Crocodile Isle (inferred)
 * The Northern Kremisphere (inferred)
 * Yoshi's Island
 * Dinosaur Land
 * Kitchen Island
 * Vibe Island
 * Party World

Also in the begining of Super Mario Sunshine, not only can Isle Delfino be seen but some islands surrounding them can be seen. Mario does not visit any of these islands thought.

Lands Not in the Mushroom World

 * Subcon exists in the dreams of characters, not a physical world.
 * The Shroob homeworld, a planet far away from the Mushroom World.
 * Earth is a distinct planet separate from the Mushroom World.
 * In Super Mario Galaxy Mario will travel to different planets across the galaxy.
 * Smithy Factory is an alternate dimension.