Recent visitors said Yellowstone Lake is beautiful and several were astounded by the size and the vibrant clear waters. Many said they drove around the lake and stopped at attractions and lookout ...

And nope. It’s not Yellowstone Lake; although this is the highest mountain lake of such a huge size in all of the US. It’s not the park’s second biggest lake, Shoshone Lake, either.

"The size is so immense that people don't appreciate it." Smith is a University of Utah geophysicist and a prominent expert on the supervolcano at Yellowstone. We're standing atop Lake Butte ...