|Description||Immense saltmarsh island floating in the Abyssal sea of Ishiar|
Mephizim, sometimes spelt 'Mephism', is the name of the stinking Abyssal realm of the demon lord Gogunta. It is a vast swamp floating on the Abyssal sea of Ishiar, Dagon's realm. This realm within a realm is very unusual for the demon lords but Dagon seems to take little interest in Gogunta's business. Compared with Dagon's realm, however, Mephizim is tiny in comparison, and the Shadow of the Sea is content to let Gogunta conduct his blasphemous rituals there.
- James Jacobs. (2010). Lords of Chaos, p. 16, 40. Paizo Publishing, LLC. ISBN 978-1-60125-250-0
- James Jacobs. (2009). Demon Lords of Golarion. Descent into Midnight, p. 58. Paizo Publishing, LLC. ISBN 978-1-60125-131-2
- James Jacobs. (2013). Demons Revisited, p. 23. Paizo Publishing, LLC. ISBN 978-1-60125-552-5