Ottawa

Ottawa was a city on Earth. In the 21st century, due to its cold climate and northern latitude, the Ice Warriors sent their Seed Pods here to create an atmosphere lethal to humans, but which the Ice Warriors could thrive in. This was foiled when the Second Doctor used the Weather Control Unit to destroy the pods with rain. (TV: The Seeds of Death)

Behind the scenes
The country of this city is not stated in this story. In the real world, Ottawa is in Canada.