Tahuna and Tainui are two small, somewhat vaguely defined suburbs which lie to the south of Andersons Bay and Musselburgh, close to Dunedin's southern coastline (Ocean Beach).
Tainui lies to the north, in the area of residential housing which lies in the southeastern corner of "The Flat" (southern Dunedin's wide coastal plain) between Victoria and Tahuna Roads in the south and Musselburgh Rise in the north.