The Diamond Tree is a giant Karri tree located 10km South of Manjimup, Western Australia on the South Western Highway.
A wooden viewing platform built in 1939 is located 52 metres up, and is the oldest wooden platform fire look-out still in use today.
The Diamond Tree is one of three climbing trees in the Southern Forests and was used as a fire lookout every summer from 1941 to 1973. The tower is still used by DEC (Department of Environment & Conservation) to support aerial surveillance from time to time. It is 51 metres high and is known for its spectacular view over the trees.