A Map of Fictional Great Britain

Hey, British friendlisters. This might catch your attention. Thanks to Jonathan Crowe's Map Room blog for the clue.

Also, does Canada have enough mythology to build a map of its own? I'd think Geist Magazine already did such a map, but I can't be sure yet.

https://londonist.com/london/maps/fake-britain-map-fictional-locations-england-scotland-wales