Japan

Japan is an island nation off the coast of east Asia.

Among the guises employed by Chancellor Goth during his battle with the Doctor in the Matrix was that of a Japanese samurai (DW: The Deadly Assassin).

The Doctor and Chris Cwej visited Japan in 1560. (NA: The Room With No Doors)

The Doctor, Rose Tyler and Jack Harkness visited Japan in 1336. (DW: Bad Wolf)

During The Year that Never Happened, the Master destroyed Japan, watching the islands and its cities and inhabitants burn (DW: Last of the Time Lords).