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The Rotstöckli ( 2,901 m ) is a peak of the Urner Alps below the Titlis , on the border between the Swiss cantons of Obwalden and Nidwalden .
 Obwalden, Nidwalden
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Obwalden, Nidwalden