Dumbleyung is a town 267 kilometres southeast of Perth in the West Australian wheatbelt. The area's main attraction is Lake Dumbleyung, the largest semi-permanent natural stretch of inland water in Western Australia.
Approximately 13 kilometres long and 6.5 kilometres wide, it is famous as the site of the late Donald Campbell's historic World Water speed record set on 31 December 1964, in the Bluebird. It is also a sanctuary for birdlife and extremely popular for water sports and picnics. The Wheatbelt Wildflower Drive begins at the town of Kukerin situated 39 kilometres east of Dumbleyung.