The Marshes of Morva are the boggy wetlands, located in the South-West district of Prydain, that serves as the home of the witches of Morva. First appearing in the Lloyd Alexander's novel, The Chronicles of Prydain, and the resulted Disney film adaptation, The Black Cauldron, the Marshes of Morva are also featured in the villains tournament, whenever new challengers approach the witches' domain, and provoke them to battle them, or ask them for a "fair trade" to bargain for.