Toronto

Toronto was a city in Canada.

In 2006, and water rationing were used in Toronto, as water shortages were common due to environmental damage. (PROSE: Iceberg)

In the early 21st century, Baskerville predicted that a nuclear device would accidentally detonate in Toronto, destroying the city, but the Eighth Doctor prevented this. (PROSE: Trading Futures)

In 2040, the Seventh Doctor helped stop a terrorist group from blowing up Pickering power station in Toronto. (PROSE: The Nuclear Option)

During the mid to late 21st century Toronto was a primary hub of the T-Mat network. (TV: The Seeds of Death)

The colony world Toronto was presumably named after the city. (PROSE: Ten Little Aliens)

Behind the scenes
Doctor Who creator Sydney Newman was born in Toronto. He later died there.