Riana is a small town in the north-west of Tasmania, next to the Dial Range. It is near Penguin, Tasmania. At the, Riana and the surrounding area had a population of 325.The fertile red soil hosts paddocks of vegetables (particularly potatoes) and dairy farms.HistoryRiana Post Office opened on 1 August 1899. Riana South Post Office opened on 20 January 1908.