Rubber Country
The Rubber Country is a region where the rocks, trees and paths are all made of rubber.
First named in Tik-Tok of Oz, ch. 9
"Just now they are crossing the Rubber Country, Your Majesty."
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
Crossed by Queen Ann's army en route to the Nome Kingdom after Tik-Tok of Oz ch3 establishes they left the mountain pass 'not in the Land of Oz at all, but in an [unknown] country.'