The Whispering Wall is the curved retaining wall of the Barossa Reservoir near Lyndoch. Its parabolic shape creates a remarkable acoustic phenomenon: words spoken in a normal whisper at one end of the 140-metre wall travel clearly to someone standing at the other end, while people standing in between hear nothing at all. It works in both directions and is as surprising on the tenth visit as on the first.
The reservoir itself is attractive, and there are picnic facilities near the wall. The approach road through the pine plantations above Lyndoch is pleasant. This is a genuinely good stop for families with children, and the acoustic effect is hard to explain until you experience it.