Question: Furka–Oberalp-Bahn Deh 4/4 I was operated in which southwestern Swiss canton?
Sentence (from "Valais"): The canton of Valais (] ; German: "Wallis" , ] ) is one of the 26 cantons of Switzerland, situated in the southwestern part of the country, around the valley of the Rhône from its headwaters to Lake Geneva, separating the Pennine Alps from the Bernese Alps.
Relevant evidence: Yes