Old river red gum tree (Eucalyptus camaldulensis) at Mambray Creek in Mount Remarkable National Park in the southern Flinders Ranges in South Australia.
Is this one tree or two? It really doesn't matter as it is a large tree. Termites eat out the heart wood of these trees and the hollow trunk acts as a chimney during bushfires causing major damage to the trees. In spite of all that, these trees are survivors and many, like this one, continue to grow and and survive. Some trees live to over 500 years!