User blog comment:Sepublic22/Should Knighton be considered one of the Sixteen Realms?/@comment-27507964-20160309023133/@comment-27747281-20160310170348

To be frank, I wouldn't be surprised if King Halbert, in his paranoia, had Merlok hide the ENTIRE kingdom from outside places, if it weren't for the fact that in Episode 3, there visitors from two different places outside of Knighton, namely owners of a gold factory and a cleaning company, I believe. Since Merlok wouldn't have the jurisdiction to place a spell over those other places, that means they would've been noticed by the people of Ninjago, interact with them, and then explain to Knighton that the Ninjagoans aren't so bad!

I dunno. It does make interesting food for thought, though.