Horsk was a location within Norhall Proper, not much is known about it, but The Vorgias were killed while investigating a haunted farmhouse in Horsk. The Daring Dragoons were then sent to investigate, and encountered a Vampire. It was described as a terrible place, merely "a random smattering of clumps of houses and stores and things like that"1. It only had a total of about 100 militia forces, but half of those were in training, or not up to snuff, so to speak2. It's mayor was Corduroy Denims.
It was "stolen" from DnD proper, the original name being Barovia, put rotated 90 degrees, either clockwise or counterclockwise. There's no way of knowing.