Marshes of Madness

The Marshes of Madness are avoided by all but the desperate. It is a realm of the Undead and a remnant of a past civilisation, forever cursed when the Crown of Sorcery was discovered on the banks of the Blind River. It is now a virulent swamp that is shunned by all. Within the marshes lies Morgheim and the insidious Tree of Beards, a testament to the folly of Dwarfs when they once tried to tame the swamp.

Source
Blood in the Badlands (supplement)

pg. 10

pg. 11