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Lake McDonald is the largest lake in Glacier National Park. It is located at 48°35?N 113°55?W? / ?48.583°N 113.917°W? / 48.583; -113.917 in Flathead County in the U.S. state of Montana. Lake McDonald is approximately 10 miles (16 km) long, and over a mile (1.6 km) wide and 472 feet (130 m) deep, filling a valley formed by a combination of erosion and glacial activity. Lake McDonald lies at an altitude of 3,153 feet (960 m) and is on the west side of the Continental Divide. The Going-to-the-Sun Road parallels the lake along its southern shoreline. The surface area of the lake is 6,823 acres (27.6 km²).