Hi!
There is a bit of galvanised water pipe hammered into the ground at Indi Spring, the source of the Murray. It was placed there by a team from RMIT in 1984, and it's got a metal can attached to it with a notepad in so you can record your visit.
This pic is from Jan 2017:
The place is officially called Townsend Corner, after Thomas Townsend, who determined the location of the easternmost source of the Murray:
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