Blue Mountain City is a fictional city featured in the animated television series "My Little Pony: Friendship is Magic." It is home to a group of ponies, including Princess Luna and the Cutie Mark Crusaders. The city is located within Equestria, a land inhabited by various magical creatures, and is known for its beautiful blue mountains and breathtaking landscape. Blue Mountain City is often visited by the show's main characters and serves as a backdrop for many adventures and events in the series.