The Triarius, a tree, is a very large Swamp Gum (Eucalyptus regnans F.Muell.) that is located in southern Tasmania, Australia. In 2010 the tree was estimated to be 86.5 metres (284 ft) tall, its diameter was 3.9 metres (13 ft), and the volume of the trunk was 219 cubic metres (7,700 cu ft).