When I first saw this as a Place of the Day location, I actually had to stop and think for a while about how to describe it. And it's not a kingdom in the strictest sense, because my first inkling was "oh, it must be a European reference of some sort". Rather, this place is located within the US, and specifically on the east coast.
The Northeast Kingdom - Vermont
Dubbed the Northeast Kingdom by a US Senator in 1949, the three counties of Orleans, Essex, and Caledonia and their fall foliage, hamlets, small villages, and lakes make up this region of upper Vermont. Lake Willoughby is often compared to Lake Lucerne in Switzerland. There's lots of snow in the winter though, so bring your boots. Or skis.