Eucalyptus deanei, the Mountain Blue Gum is a eucalyptus

Eucalyptus

Eucalyptus is a diverse genus of flowering trees in the myrtle family, Myrtaceae. Members of the genus dominate the tree flora of Australia...

 tree of mountain country of central New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

. Eucalyptus deanei is a large to very large tree, usually 30 to 50 metres tall, sometimes achieving a much greater height. The largest known was measured in 1978 at 78 metres tall, and remeasured in 2010 at 71 metres tall with a diameter at breast height of 2.5 metres.

They are most famously seen at the Blue Gum Forest, in Blue Mountains National Park

Blue Mountains National Park

The Blue Mountains National Park is a national park in New South Wales, Australia, 81 km west of Sydney, and located in the Blue Mountains region of the Great Dividing Range. The park covers 268,987 hectares. The boundary of the park is quite irregular as it is broken up by roads, urban areas...

. Also seen but seldom noticed by drivers on the Mooney Mooney Bridge

Mooney Mooney Bridge

Mooney Mooney Creek Bridge is a twin cantilever bridge that spans Mooney Mooney Creek in Brisbane Water National Park on the Central Coast of New South Wales as part of the Sydney-Newcastle Freeway. It is the highest road bridge in Australia as measured from the road bed to the water below...

 on the main road north from Sydney

Sydney

Sydney is the most populous city in Australia and the state capital of New South Wales. Sydney is located on Australia's south-east coast of the Tasman Sea. As of June 2010, the greater metropolitan area had an approximate population of 4.6 million people...

.