She merely went into a great chamber of her castle, known as the Magic Room, where she performed a magical ceremony which caused the mountain pass that led from Oogaboo to make several turns and twists.

The result was that when Ann and her army came to the end of the pass they were not in the Land of Oz at all, but in an adjoining territory that was quite distinct from Ozma's domain and separated from Oz by an invisible barrier.
As the Oogaboo people emerged into this country, the pass they had traversed disappeared behind them and it was not likely they would ever find their way back into the valley of Oogaboo.

They were greatly puzzled, indeed, by their surroundings and did not know which way to go.

None of them had ever visited Oz, so it took them some time to discover they were not in Oz at all, but in an unknown country.
"Never mind," said Ann, trying to conceal her disappointment; "we have started out to conquer the world, and here is part of it.

In time, as we pursue our victorious journey, we will doubtless come to Oz; but, until we get there, we may as well conquer whatever land we find ourselves in." "Have we conquered this place, Your Majesty ?" anxiously inquired Major Cake.
"Most certainly," said Ann.