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The Blue Mountains of New South Wales, Australia, roughly 100 kilometres west of Sydney, are a range of sandstone "mountains" that reach to at least 1190 metres above sea level (in the Lithgow area).
The Blue Mountains lie in the local government areas of the City of Blue Mountains, the City of Hawkesbury, the City of Lithgow and Oberon.
The Blue Mountains were thought to be impenetrable by the early settlers of Sydney, and were not crossed until 1813, by Blaxland, Wentworth and Lawson.