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partly fills a 2148 ft caldera that was formed around 7,700 (± 150) years agoby the collapse of the volcano Mount Mazama. No rivers flow 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 150 years. With a depth of 1949 ft, the lake is the deepest in the United States. In the world, it ranks tenth for maximum depth, as well as fifth

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