You must have seen it somewhere before - it wasn't me and I have looked through the Northern Territories section on TN - there isn't another one. This is a fairly popular excursion from Alice Springs, so you may have seen it on a travel show. I have been twice, the second time we drove ourselves in a 4x4 - it was great we had the place pretty much to ourselves. There are also some really massive, equally rare cycads there.
Last Survivors of a Vanished Climate (44)