This map plots the settings and references in Heidi

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Page 4. " She came from Prättigau, further down the valley "
Prättigau is the name of a valley in the Swiss canton of Graubünden. It is a popular area for skiing, sledging and walking and contains many picturesque villages such as Saas im Prättigau.  Klosters, the world-famous ski resort, is also in the Prättigau valley.