The Glacier National Park in the U.S. state of Montana, on the border with Canada, is home to more than 700 lakes, although only 131 of these lakes have names. Approximately 200 lakes are over five acres in size, and a dozen of them exceeds thousands of acres, which in unusual for mountain lakes. Additionally, the waters of the lakes are remarkably clear. This is owning to the year long low temperatures that prohibit the growth of planktons. It is not unusual to see details on the bottom of the lakes at a depth of 30 feet or more.
One of the most striking feature of some of these lakes is the presence of a variety of colored rocks and pebbles just below the water surface and on the shores. The rocks ranges in color from dark red to maroon, and from green to blue. Colored pebbles are seen in abundance on the shores of Lake McDonald on the western side of the park. Lake McDonald is the largest of the lakes of Glacier National Park with a surface area of 6,823 acres. It is also the longest at over 15 km, as well as the deepest lake at 141 meters.
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