Question: Are both mountains, Piz Chavalatsch and Breithornzwillinge, located in the same country?
Sentence (from "Breithornzwillinge"): The Breithorn Twins are twin peaks of the Breithorn range of the Pennine Alps, located on the border between Switzerland and Italy, between the canton of Valais and the region of Aosta Valley.
Relevant evidence: Yes