In the user account Address field, certain countries have their respective state, province, prefecture, etc. available under the Region field. For example, if we select United States, China, Germany, Canada, or Norway, we will see a list of the municipalities available.
If we select Japan as the country, the region list is blank.
Populate a list of Japanese prefectures under the Regions field in the following order:
The reason why it should be in this specific order is because the Japanese prefecture list is ordered by geographical location.
As a feature, I would also like to request that in non-Japanese localization (e.g. English), the list of prefectures can be romanized in the following manner.