This is Blue Hole, a waterfall, near Elizabethton, TN. It's really 3 levels of waterfall this being the last that goes into the "blue hole" basin. I edited this in LIghtroom and did some cleanup of the water, and some dodging and burning in Photoshop. Shot on a Sony A7R3 with a 16-35 f/4 Sony lens and probably a circular polarizer.