Krakatoa
From Tardis Wiki, the free Doctor Who reference
Krakatoa is a volcanic island in the south Pacific Ocean. It erupted in 1883.
Sometime prior to his third incarnation, the Doctor witnessed the eruption; during this event, he also hears Primords for the first time. (DW: Inferno)
That same day, a sketch of Ninth Doctor washed up on a beach on Sumatra. It eventually found its way into Clive Finch's collection of artifacts related to the Doctor. (DW: Rose)
Tenth Doctor and Rose Tyler visited Indonesia, encountered the alien Chalderans, and escaped in the TARDIS just as the volcano erupted. (DWAM: Under the Volcano)
