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A border was a type of geographic boundary.
Kahler-Tek established a border surrounding the town of Mercy, Nevada. (TV: A Town Called Mercy [+]Loading...["A Town Called Mercy (TV story)"])
The partition of India established a border between the nations of India and Pakistan. (TV: Demons of the Punjab [+]Loading...["Demons of the Punjab (TV story)"])
UNIT sent a hypersonic jet past the border into Russia to enlist their resources in launching a warhead against the Cybermen. (TV: The Invasion [+]Loading...["The Invasion (TV story)"])
In the 2010s, the Mexico border was among the places where newly-hatched Zygons were settled across the world as part of Operation Double, resulting in a minority of Zygons residing in New Mexico under the pretence of being British migrants. (TV: The Zygon Invasion [+]Loading...["The Zygon Invasion (TV story)"])
In 2017, the armies of America, Russia and China converged near the border in Turmezistan, where the Monks' pyramid appeared. (TV: The Pyramid at the End of the World [+]Loading...["The Pyramid at the End of the World (TV story)"])
At the beginning of the New Dalek Paradigm, they established several "space fortresses", built along the borders of the Draconian, Sontaran and Morok Empires. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe [+]Loading...["Dalek: The Astounding Untold History of the Greatest Enemies of the Universe (short story)"])