In Oregon sits fantastic Crater Lake. It is famous for its deep blue clear waters. A volcano called Mount Mazama collapsed around 8,000 years ago, forming a caldera which filled with water. At 2,148 feet deep, there are no rivers that flow in or out of the lake to replenish the water. The water is purely from rainfall and snow melt, and through condensation, the water is replaced every 250 years.
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