While I was staying at El Questro, I walked through the beautiful Emma Gorge. The walk is quite easy and while not long finishes at a large pool of crystal clear water suitable for swimming. When the shot was taken, the water was filled with people. I managed to remove the swimmers by taking multiple shots spaced part and masking out each person as they moved around between shots.
The image below is the original crop where you can get a appreciation of the what can be found at the end of the walk. The swimmers were accompanied by two large brown snake who were exploring the water edges under the rock ledge just to the right of the image.