The Black Hills is an area located just outside of Burkittsville, Maryland, in Frederick County. It's the location of the Black Hills Forest, as well as many incidents involving the Blair Witch legend.
In 1994, Heather Donahue, Joshua Leonard and Michael Williams went into the Black Hills Forest to film a documentary about the Blair Witch, but they never returned.
The Maryland State Police conducted a search of the area, but found no trace of the students.