Underground Tunnel
A tunnel being dug by the Nome King under the Deadly Desert toward the Emerald City.
First named in The Emerald City of Oz, ch. 18
She saw the underground tunnel, reaching far underneath the Deadly Desert which separated the Land of Oz from the mountains beneath which the Nome King had his extensive caverns.
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
The Nome King's tunnel runs under the Deadly Desert itself, not inside an Oz country.
What the books say it is
appearance reaches far underneath the Deadly Desert 1 chapter
She saw the underground tunnel, reaching far underneath the Deadly Desert which separated the Land of Oz from the mountains beneath which the Nome King had his extensive caverns.
The Emerald City of Oz, ch. 18