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

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

The Master had the TARDIS take the Doctor and Izzy Sinclair to Japan in early 17th Century, during an isolationist period, to witness the chaos being caused by the alien "Gaijin". (DWM: The Road to Hell)

The Doctor witnessed the Earth's fury at the Japanese island of Okushiri in 1720. (MA: The English Way of Death)

During the Year That Never Was, the Master destroyed Japan, watching the islands and its cities and inhabitants burn. (DW: Last of the Time Lords) Martha escaped Japan and made her way towards Europe. (TDA: The Story of Martha)

According to Ianto Jones, Japan was one of the first countries the Daleks landed during the War in the Medusa Cascade. (DW: The Stolen Earth)

Due to the destabilisation of the Myloki conflict of 2066-8, Japan invaded New Zealand; by 2096 Tokyo was an independent city-state. (PDA: The Indestructible Man)