Mapchart.net is a nice tool to create maps for free.
Here is a map of all the Japanese prefectures I have QSLed so far.
https://www.mapchart.net/japan.html
In 2018 I went with a few radio friends to Parkalompolo Sweden. There you can catch lots of radio-stations from all over the world. Receiving stations from Japan is extraordinary fun and results most of the time in very nice replies from the stations. All reception reports were sent by regular mail. It is widely known that email is a no-go for Japanese stations. (Now more than 40 stations).
Mapchart.net is a nice tool to create maps for free.
Here is a map of all the Japanese prefectures I have QSLed so far.
https://www.mapchart.net/japan.html
List updated: JOIK NHK R 1 , Sapporo, 567 kHz (sent a Fup and replied in 11 weeks) JOAK NHK R 1, Shobu-Kuki 594 kHz JOBK 666 NHK R 1, Osaka...