Morbus is a city in the Toonolian Marshes. Morbus was once inhabited by a now extinct people, the city was ruined when Ras Thavas found it, he rebuilt the city to serve as the home for the Hormads. The city was ruled by seven jeds, until the third jed usurped them and crowned himself Jeddak. However one of the vats in Ras Thavas' labs began to grow and unusual mass of flesh it absorbed much of the island, either killing the hormads or driving them into the marsh. John Carter and a fleet from Helium would destroy the mass of flesh, and much of the island as well .