Bunbury, a seaport and municipal town of Wellington county, Western Australia, 112 m. by rail S. by W. of Perth. Pop. (1901) 2455. The harbour, known as Koombanah Bay, is protected by a breakwater built on a coral reef. Coal is worked on the Collie river, 30 m. distant, and is shipped from this port, together with tin, timber, sandal-wood and agricultural produce.