Crater Lake Caldera

Crater Lake Caldera is a lake located in south-central state of Oregon. This lake is the main feature of Crater Lake National Park (Crater Lake National Park) and is famous for its deep blue color and clarity of the water. Lake partially fills the caldera (655 m) is almost 2148 feet within the established around 7700 (± 150) years ago by the collapse of the volcano Mount Mazama. There are no rivers flowing into or out of the lake, evaporation is compensated by rain and snowfall at a rate such that the total amount of water changed every 250 years.

The lake is surrounded by cliffs with a height of up to two thousand feet, and is equipped with two small islands and spectacular blue water, which makes this lake as a perfect place for photographers. And the lake is known for the "Old Man of the Lake", a full-sized tree which is now a stump that has been bobbing vertically in the lake for over a century. Because of cold water, trees have been rather well preserved.

The lake has a relatively high level of dissolved salts, total alkalinity, and conductivity. Average pH generally ranges between 7 and 8.

On June 12, 1853, John Wesley Hillman reported the first person of European descent to see what he named "Deep Blue Lake" in Oregon. The lake was named at least three times, as Blue Lake, Lake Noble, and finally Lake crater.

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