First, "tone" refers to how an author/narrator feels about their subject matter or characters. So a question about tone would be stated: "How does the description of the region's landscape represent the tone of the author/narrator?
The way your question is worded suggests you actually mean "mood," which is the emotional feeling communicated to you by the story.
Tone and mood don't necessarily have to match. The tone may be detached yet the mood frightening. The tone may express fondness yet the mood express depression, etc.
If you need tone, I'd say "who didn't help matters either" indicates the author and/or narrator has a bitter feeling toward the subject of the story, thus has a bitter tone.
If you need mood, I'd say "the Region was, cruel to live in" indicates a feeling of desperation and despair being communicated to the reader, thus communicating a desperate and despairing mood.