Question: What region whose name means "Estate of the Salt Chamber" has Austria's third largest lake?
Sentence (from "Bala Lake"): The town of Bala sits at its north-eastern end and the narrow gauge Bala Lake Railway runs for 3 mi along the lake's south-eastern shore, and continues south-westward to the village of Llanuwchllyn (whose name means "church ['llan'] above ['uwch'] the lake ['llyn'").
Relevant evidence: No