"I heard some kids talking about a hidden oasis in the middle of the mountains in the north. Is that true?" asked Leslie with curious eyes.
'Huh, oasis? In the middle of those cold and scary-looking mountains?' thought Faerie with a face full of disbelief.
During her reading of the novel
That means there are two possibilities.
One. As the name suggests, hidden oasis means that this oasis is tightly hidden so that even the main character, Bismarck, doesn't even know about the existence of this hidden oasis, as well as other important supporting characters, including Baro Rosent himself.