Crater Lake is located in Southern Oregon on the crest of the Cascade Mountains. It lies inside a caldera (a large crater formed by volcanic explosion or by collapse of a volcanic cone) created when the 12,000 foot high Mount Mazama collapsed 7,700 years ago following a large eruption. The lake, supplied by an average of 533 inches of snow per year, is 1,943 feet deep, making it the deepest lake in the United States and the seventh deepest in the world.MP3: Liz Phair - Crater Lake