Area 51 is the name of a secret facility owned by the Royal Mushroom Kingdom Army (RMKA), which in turn is owned by the Mushroom Kingdom government, and is located in a desert somewhere in the Mushroom Kingdom, based on the real-life location in Lincoln County, Nevada. It is built to keep aliens and extraterrestrial beings from anybody else. It makes its debut appearance in SMG4: Mario Raids Area 51.


Area 51 is located somewhere in the desert plains of the Mushroom Kingdom, and it's adjacent to Area 64 (from SMG4: AREA 64) across a road.


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