Taken from the Canadian side of Niagara Falls. I used the Panasonic Lumix G9 and the Leica 100-400, handheld at 200mm. If you are familiar with the with the area, I was standing right under the start of the zipline, about 8/10ths of a mile from where the boat is - the only place to get a straight shot.
The image was processed in Darktable.