The Greater Blue Mountains Area is a World Heritage Site in the Blue Mountains of New South Wales, Australia. The 1,032,649-hectare (2,551,730-acre) area was inscribed on the World Heritage.
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.
José Carlos Pedrero