Crater Lake, Existence of

Here's something I didn't really know: before Oregon's Crater Lake was created 7,700 years ago by a volcanic eruption, there was a mountain 12,000 ft high there.

Actually, the eruption only blew a mile off the mountain, and the rest collapsed into the empty magma chamber.

Also, it's the deepest lake in the United States (1,943 ft) and the 7th deepest in the world.

(By the way, I read that Anthony Watts denies the existence of Crater Lake, 

as well as most of southern Oregon, except, oddly, those areas 

of the coastal  region that are both less than 10 miles from the 

shoreline and greater than 10 feet in elevation.)