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In the first verse , its north-south extension is described by the way of the Eisack source and the Salurner Klause , a bottleneck which used to mark the border between the German and Italian-speaking area .
 Salurner Klause
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Salurner Klause