1. Crater Lake, Oregon

2. Crater Lake was formed after the collapse of an ancient volcano, posthumously named Mount Mazama. This volcano violently erupted approximately 7700 years ago. That eruption was 42 times as powerful as the 1980 eruption of Mount St. Helens. The basin or caldera was formed after the top 5000 feet of the volcano collapsed. Subsequent lava flows sealed the bottom, allowing the caldera to fill with approximately 4.6 trillion gallons of water from rainfall and snow melt, to create the seventh deepest lake in the world at 1,932 feet

3. Ridges of the older volcano

4. Mt. Mazama Distribution of ash from the eruption of Mount Mazama

6. View of the caldera

7. Crater lake In the winter

9. Final aerial view of volcano