Sumatra was an island in the south Pacific Ocean.

The Second Doctor, Jamie McCrimmon and Victoria Waterfield visited a post-21st century Sumatra. (AUDIO: The Great Space Elevator)

On the same day as the volcanic eruption of Krakatoa in 1883, a sketch of the Ninth Doctor washed up on a beach on Sumatra. It eventually found its way into Clive Finch's collection of artefacts related to the Doctor. (TV: Rose)

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