Crater Lake is a caldera lake located in Oregon; due to several unique factors, most prominently that it has no inlets or tributaries, the waters of Crater Lake are considered one of the world's most clearest. The lake partly fills a nearly 4,000 foot (1,220 m) deep caldera that was formed around 5,677 (± 150) BC by the collapse of the volcano Mount Mazama. Its deepest point has been measured at 1,949 feet (594 m) deep, making it the deepest lake in the United States, and the ninth deepest in the world.
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