A river cascades through a slot canyon at Centennial Glen, near Blackheath, in Australia's Blue Mountains.
Sony A7r3 with 24-70mm f/2.8 GM and Nisi circular polariser. 30mm, f/9, ISO 50. Three exposures per position, at 1, 4 and 15 seconds, manually blended. Cropped from 3-shot panorama, comprising around 1.5 frames worth of image.