Japan

Japan is an island country in Asia, Earth, where Nintendo of Japan is located and where many Mario games are made. Japan also made an appearance in NES Open Tournament Golf as one of the playable countries along with the United States of America and the United Kingdom. It also appeared in Mario is Missing! where Luigi had to go here, more specifically Tokyo.

Trivia

 * In Super Mario Bros. 3, in Water Land, on the island where the castle is, the island is shaped like Japan. Also, the castle is located right where the Nintendo of Japan Headquarters in Kyoto would be if the island was in fact really Japan.