Charmington is one of The 18 Regions of Auradon and the home of Snow White and Prince Florian. It is named after King Charming, who ironically lives in Cinderellasburg. With a bridge it is connected to Shallows Keep. There is one town in the forest called Eden. It appears in the movie, on the maps and is mentioned in School of Secrets.
In one of the canon maps there was a castle named "Snow White's Castle" far away from Charmington, meaning Charmington is the Prince's kingdom.