This info in addition to the maps posted by Adam should help pinpoint where 99% of your Japanese teas are coming from geographically. Please let me know of any errors or additions. Remember, we are trying to keep this relevant to the West.
The three most common regions/prefectures for Japanese tea to the West are Uji, Kyoto
A few of the more common tea producing regions that are not prefectures (prefecture listed here to help illustrate where they are located) Prefectures are bold to help:
Uji is in Kyoto
(as shown on the first map)
Ureshino is in Saga
Yame is in Fukuoka
And a few lesser know regions/prefectures whose teas are found in the West, although rarely. Prefectures are bold:Kumamoto
- some senchaMie Miyazaki
- some senchaNara
- some matcha comes from here, neighbors Shizuoka prefecture
- some sencha, but very uncommon. The sencha is most often named Sayama. North and east of Shizuoka.