<P> This area is one of rugged tablelands, sheer cliffs, deep, inaccessible valleys and rivers and lakes teeming with life . The rare plants and animals that live in this natural place relate an extraordinary story of Australia's antiquity, its diversity of life . This is the story of the evolution of Australia's unique eucalypt vegetation and its associated communities, plants and animals . </P> <P> The Greater Blue Mountains Area consists of 10,300 square kilometres (4,000 sq mi) of mostly forested landscape on a sandstone plateau 60 to 180 kilometres (37 to 112 mi) inland from the Sydney central business district . The area includes vast expanses of wilderness and is equivalent in area to almost one third of Belgium, or twice the size of Brunei . </P> <P> The area is called "Blue Mountains" based on the fact that when atmospheric temperature rise, the essential oil of various eucalyptus species evaporates and disperse in the air, then visible blue spectrum of sunlight propagates more than other colours . Therefore, the reflected landscape from mountains seems bluish by human eyes . </P> <P> The property, which includes eight protected areas in two blocks separated by a transportation and urban development corridor, is made up of seven outstanding national parks as well as the famous Jenolan Caves Karst Conservation Reserve . These are the Blue Mountains National Park, Wollemi National Park, Yengo National Park, Nattai National Park, Kanangra - Boyd National Park, Gardens of Stone National Park and Thirlmere Lakes National Park . </P>

How did the blue mountains get their name
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