Mario Land

Mario Land is where the events of Super Mario Land 2: 6 Golden Coins took place. It was the location of Mario's Castle, which Wario stole. The castle hasn't been seen in other games, and has likely been replaced with Mario's House.

A "Mario Land" was also featured in Mario Party 2. The land was split up into different game boards: Horror Land, Western Land, Mini-game Land, Pirate Land, Space Land, and Mystery Land. Additionally, later in the game Bowser and a Koopa Kid kidnapped Toad and took over part of Mario Land, calling it Bowser Land.

The name came about when Mario and his friends were fighting over what the land should be called. Toad convinced them to name the land after whoever defeated Bowser. Depending on who became the superstar, the land could also be called Luigi Land, Wario Land, Peach Land, Yoshi Land, or Donkey Kong Land. However, regardless of the character the land will always end up being called Mario Land in the end.

Because it does not closely resemble the "Mario Land" of Super Mario Land 2, it is unclear as to whether these are canonically the same land.