|"Is this all real? Or has this been happening inside my head?"
The topic of this article is of a real-life subject that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really exists), and, as such, details contained in this article may differ from real world facts.
Dorset is a county in the southwest of England on the English Channel coast, in the West Country, bordered by Devon to the west, Somerset to the north-west, Wiltshire to the north-east and Hampshire to the east, and includes Wimbourne and Millburn.