Question: What census-designated place straddles Gallatin and Madison counties, and was home to the Moonlight Basin ski resort?
Sentence (from "Moonlight Basin"): In October 2013, it, along with ski terrain within the Club at Spanish Peaks, were consolidated into Big Sky Resort, making Big Sky the largest single ski resort in the United States, with 5,750 acres (2,330 ha) of terrain and over 30 ski lifts.
Relevant evidence: No