Circular Pool - water cascades down a steep, heavily with fern covered, terraced canyon wall into picturesque Circular Pool. . Dales Gorge, Hamersley Range, Karijini National Park, Pilbara, Western Australia. The dark turquoise coloured water contrasts nicely with the bright red canyon walls. This pool is an oasis in the very dry and arid Pilbara region and the cool and moist air allows lush plant life where normally only gum trees can survive. Rocks exposed at the gorges in Karijini originated