<Li> Mount Hay (944 m or 3,097 ft) </Li> <Li> Mount Irvine (850 m or 2,789 ft) </Li> <P> The Blue Mountains are a dissected plateau carved in sandstone bedrock . They are now a series of ridge lines separated by gorges up to 760 metres (2,490 ft) deep . The highest point in the Blue Mountains, as it is now defined, is an unnamed point with an elevation of 1,189 m (3,901 ft) AHD, located 7 kilometres (4.3 mi) north - east of Lithgow . However, the highest point in the broader region that was once considered to be the Blue Mountains is Mount Bindo, with an elevation 1,362 m (4,469 ft) AHD . A large part of the Blue Mountains is incorporated into the Greater Blue Mountains Area World Heritage Site, consisting of seven national park areas and a conservation reserve . </P> <P> The Blue Mountains area is a distinct physiographic section of the larger Hunter - Hawkesbury Sunkland province . This is in turn a part of the larger East Australian Cordillera physiographic division . </P>

How high are the blue mountains in australia