Proposed Canon
First Appearance: IPTSF Text 50
Efbaum is a Level 5 Haffaton City. It lies at the end of a yellow road and is Emerald in hue. It was once the Capital of el-Efbaum, the most powerful Side in Erfworld and run by Charlie. It is the location of the Olive Garden where Judy Gale, the Overlord of Haffaton, is kept imprisoned.
 Real-World References
The City is, of course, related to the Emerald City from the Wizard of Oz and presumably named for the author of that story L. Frank Baum.
Its name may sound like 'F-Bomb' when spoken aloud.
Judy refers to the city as 'old el-Efbaum.' Since 'el' means 'the' in Spanish, this effectively makes the city's name 'the Efbaum,' simultaneously incorporating L. F. Baum's name and 'the F-Bomb.'