Known as the Great Fountain Geyser, located in Yellowstone National Park.
I love the sky behind the geyser and how it's reflected in the the water on the geyser. I also like this shot because I went to Yellowstone this summer, but I never saw this geyser blow, so it's really cool to see how it looks when it it's erupting. It's a perfectly timed shot where all the eruption is headed up, but none has started to mist down yet like it will soon.