The Capertee Valley, located in New South Wales, Australia, is renowned as the world's widest canyon, surpassing the Grand Canyon. Spanning 30 kilometers, it is only 1 kilometer wider than the Grand Canyon, though not as deep, with depths ranging approximately from 1,000 to 1,857 meters. The valley traces the Capertee River's path through the Sydney Basin, which is composed of Permian and Triassic sedimentary rocks to the west of the Blue Mountains. BirdLife International has designated the valley as an Important Bird Area, highlighting its significance as the primary breeding ground for the endangered regent honeyeater. Hosting around 236 bird species, the valley contributes to 10% of Australia's biodiversity within a World Heritage-listed region and is the habitat of the elusive Regent Honeyeater. The Gardens of Stone beckon with their dramatic landscape, featuring magnificent rock pagodas, sandstone cliffs, canyons, and awe-inspiring scenic views, along with the historical Glen Davis township and the remnants of the Oil Shale Works.