The Explorers Tree was a Blue Mountains ash tree formerly located at Explorers Hill, about 2 km north-west of Katoomba, New South Wales, Australia.
It is well known as the tree on which Gregory Blaxland, William Lawson and William Charles Wentworth, the explorers who achieved the first known successful crossing of the Blue Mountains of New South Wales by European settlers, carved their initials in 1813.
Wikipedia https://en.wikipedia.org/wiki/Explorers_tree
Address 390 Great Western Highway, Blue Mountains 2780, Australia
Coordinates -33°42'13.081" N 150°17'26.761" E