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United States · North America
Crater Lake
A shattered volcano holds America's deepest secret—a mirror of impossible blue, born from fire seven millennia ago.
Why Crater Lake stands out
Crater Lake fills a 2,148-foot caldera carved when Mount Mazama collapsed around 7,700 years ago. At 1,949 feet deep, it holds the distinction of being the deepest lake in the United States, ranking tenth globally for maximum depth. The water's luminous blue clarity draws visitors to this volcanic amphitheater in south-central Oregon.
The geography and story of Crater Lake
No rivers feed or drain this crater—instead, rain and snow sustain it in perfect balance, replacing the entire volume every 150 years. The lake exists in quietude, evaporation matched by precipitation, a closed system of remarkable purity tucked within the Cascade Range's ancient geology.
Crater Lake's waters are so pristine that the entire volume renews through rainfall and snowfall alone, with no rivers entering or leaving for over seven thousand years.
Crater Lake at a glance
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Test yourself
Which North American lake is so isolated that rain and snow alone have sustained it for 7,700 years with no rivers flowing in or out?
Crater Lake in Oregon is the only one of these four places that is a closed hydrological system fed entirely by precipitation, with no inflowing or outflowing rivers—a unique characteristic that has maintained its pristine waters since Mount Mazama's collapse.
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