Tunnack is a rural locality in the local government area of Southern Midlands in the Central region of Tasmania. It is located about south-east of the town of Oatlands. The 2021 census determined a population of 212 for the state suburb of Tunnack.
Tunnack was gazetted as a locality in 1974. The name is an Aboriginal word for âÂÂcoldâÂÂ.
The Coal River forms much of the northern and western boundaries.
Tunnack experiences an oceanic climate (Köppen: Cfb) with mild, drier summers and cool, wetter winters. The wettest recorded day was 9 June 2011 with of rainfall. Cooled by its moderate altitude, Tunnack's extreme temperatures ranged from on 25 January 2003 to on 22 May 2010.
The C312 route (Tunnack Road / New Country Marsh Road) enters from the north and runs through to the south-east, where it exits. Route C342 (Eldon Road) starts at an intersection with C312 and runs south-west until it exits.