The Mannaseh Swamp lies near the Savannah, at the junction of the Urubamba and Pachacacha Rivers of Sapience. A strange young woman named Apollonia resides in the swamp, as does Maeglor, the Trollish language tutor. The Mannaseh was once the location of the fabled city of Trolls, Kasmarkin, which sunk into its depths long ago.