The Jamison Valley forms part of the Coxs River canyon system in the Blue Mountains of New South Wales, Australia. It is situated approximately 100 kilometres west of Sydney, capital of New South Wales, and a few kilometres south of Katoomba, the main town in the Blue Mountains. The Jamison Valley stretches north-south from just outside Katoomba to the Mount Solitary ridge; in this direction it is approximately 4 kilometres (2.5 mi) long. From west to east, it stretches from Narrow Neck Plateau to Kings Tableland, making it approximately 10 kilometres (6.2 mi) wide. Like the entire Sydney and Blue Mountains region, the valley is a sandstone area, characterised by steep sandstone cliffs. Deeper into the soil there is a layer of shale, which is softer than the sandstone. As this layer of shale was eroded by the watercourses, it collapsed and brought the sandstone down with it, creating the characteristic sandstone valleys and canyons of the Blue Mountains, of which the Jamison Valley is one. (Source: Wikipedia.org, CC BY-SA)