Saint Mary Lake is the second-largest lake in Glacier National Park, in the U.S. state of Montana.Located on the east side of the park, Going-to-the-Sun Road parallels the lake along its north shore. At an altitude of 4,484 feet (1,367 m), Saint Mary Lake's waters are colder and lie almost 1,500 feet (460 m) higher in altitude than Lake McDonald, the largest lake in the park, which is located on t...
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