Blue Mountains, (1) the name of a branch of the Dividing Range, New South Wales, which run very nearly parallel with the coast, about 80 miles inland. It was not till 1813 that a practicable passage was found over them into the Bathurst Plains. The highest point of the Blue Mountains, Mount Beemarang, is 4100 feet high, and some parts of the road which crosses them are 3400 feet above the sea. A line of railway crosses the Blue Mountains, in the construction of which great engineering difficulties have been overcome. The
Jenolan Caves (q.v.), in the limestone of the Blue Mountains, are remarkable for their great size.—(2) The Blue Mountains, in the centre of Jamaica, attain in the West Peak 7105 feet.