According to the book, Darkmeyer makes up the northern half of the Sanguinesti region while Meiyerditch makes up the southern half. This suggests that Castle Drakan is at least part of Darkmeyer, and that Meiyerditch may be larger than first believed.
The book states that Darkmeyer is the home of Lord Lowerniel Vergidiyad Drakan, the vampyric overlord of Morytania and betrayer of Zaros. Some people believe that Darkmeyer is accessible from the small castle in the east of Meiyerditch. There is, however, no way for players to access it currently. Darkmeyer is believed by some people to be where most of the Vampyre population live.