of Japan is not only identical in name to Kanto in the Pokemon world, it is also very similar geographically; however, the western part of the game map corresponds to Eastern
In Japan, the Kantō region is often contrasted with the Kansai region which like Johto is to the west. However, Johto is geographically more similar to the Kansai region and the Western
Chūbu region combined.
Hoenn is based on the southernmost parts of Japan-Kyushu and surrounding islands.
Sinnoh is based on the northernmost major island of Japan, Hokkaido. Part of Kunashir Island, which is in dispute between Russia and Japan, is also included.
Unova is based on New York City (mostly Manhattan) and parts of eastern New Jersey.
Kalos is based on the northern half of Metropolitan France and the Channel Islands which are part of the British Isles.
There’s no secret in this one, Alola is simply based on the US state of Hawaii.