Tally Lake near Whitefish is the deepest natural lake in Montana at 492 feet (150m). The mountains and valleys of the watershed also are scattered with numerous tarns (small alpine lakes).
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Flathead Lake is the largest natural body of freshwater (by surface area) in the western U.S. and is also one of the cleanest lakes in the world.
Lake Baikal, in Siberia, holds the distinction of being both the deepest lake in the world and the largest freshwater lake, holding more than 20% of the unfrozen fresh water on the surface of Earth. It is also the oldest freshwater lake in the world, with an estimated age of 20 million to 25 million years.
The lakes in the mountains that have vivid blue and green colours are glacier fed. As the melt water from a glacier starts to flow in the spring time it carries with it glacier silt or rock flour. The silt is created when rocks underneath the surface of the ice are grinding from the movement of the glacier.
Other lakes are so big that they are called seas. The Caspian Sea, in Europe and Asia, is the world's largest lake, with an area of more than 370,000 square kilometers (143,000 square miles). Lakes also vary greatly in depth. The world's deepest lake is Lake Baikal, in Russia.