Upsidedown
Upsidedown is one of the nine levels of the Underworld, said to have earthscrapers forty feet low.
First named in The Yellow Knight of Oz, ch. 7
After that come Down, Upsidedown, Farther Down and Allthewaydown.
Where this is
placed Beyond the desert worked out
read out of the chapters cited on this page, not stated in any one sentence of them
Another named level of the same Underworld beneath our world as Underneath and Underworld.