Swamp of Undeath

From Ardrana

The Swamp of Undeath is a huge expanse of marshy land in the western MidLands, between the Vorilon River and Shael i'Vor. It is called the Swamp of Undeath because those who have traveled in it have often encountered undead creatures, especially zombies.

Rumor has it that somewhere deep within the swamp lies a castle, where Lord Zathmore holds sway. Whether Zathmore is still alive or is himself some kind of powerful undead creature such as a lich is a matter of some speculation, as is everything about this legend.