Japan's Weirdly Out Of Place Region Name

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SOURCES AND FURTHER READING
List of Japanese prefectural name etymologies: https://en.wikipedia.org/wiki/List_of...
Prefectures of Japan: https://en.wikipedia.org/wiki/Prefect...
List of administrative divisions by country: https://en.wikipedia.org/wiki/List_of...
Administrative division: https://en.wikipedia.org/wiki/Adminis....
Prefecture: https://en.wikipedia.org/wiki/Prefecture
Why 'prefecture' for Japanese administration areas?: https://english.stackexchange.com/que...
Why does Japan have Prefectures?: https://japanthis.com/2013/07/11/why-...
The Isolation of Japan: https://www.butterfield.com/blog/2015...
Todōfuken: http://www.todofuken.net/
Japan's geographical layer cake: https://www.japantimes.co.jp/life/201...
Place names in Japan: https://ipfs.io/ipfs/QmXoypizjW3WknFi...
Prefecture on Etymonline: https://www.etymonline.com/word/prefe...
Prefecture Definition: https://www.merriam-webster.com/dicti...
The Tokugawa Shogunate: https://www.thoughtco.com/tokugawa-sh...
The Meiji Restoration: https://www.britannica.com/event/Meij...
Fiefdom: https://www.merriam-webster.com/dicti...