Top 10 national and state parks in Oregon — theguardian.com

Today, Crater Lake national park in western Oregon is known for having one of the deepest, clearest lakes in the world, but 7,700 years ago, the landscape stunned witnesses for a different reason: the eruption of the Mount Mazama volcano, which created Crater Lake, is thought to be one of the greatest geologic catastrophes ever witnessed by humans. After it erupted, Mount Mazama collapsed, leaving behind a crater more than 1,200 metres deep – and 8km north to south and 10km east to west – that eventually filled with rain and snowmelt.

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