Crater Lake is a caldera lake
in the western United States, located in south-central Oregon. It is the main
feature of Crater Lake National Park and is famous for its deep blue color and
water clarity. The lake partly fills a nearly 2,148 foot deep caldera
that was
formed around years ago
by the collapse of
the volcano Mount Mazama. There are no rivers flowing into or out of the lake;
the evaporation is compensated for by rain and snowfall at a rate such that the
total amount of water is replaced every 250 years.
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