Canterlot

Canterlot is a city first featured in the series' premiere episode as the residence of Twilight Sparkle, where she studies under Princess Celestia. The city holds the royal castle, making it the capital of Equestria. It is also the venue of important cultural events like the Grand Galloping Gala. The name of the city is a portmanteau of "canter," a three-beat horse gait, and Camelot, a British kingdom from Arthurian legends.

In When the Cold Breeze Blows Away, it is where the Grand Alliance would came to allied with Equestria in World War III. And also it is where Battle of Canterlot will be sealed on Princess Celestia's fate in during USRAC War