The cache you seek is not in the water - to locate the final coordinates you must first complete the Mindarie Wanderer Adventure Lab series. Each location will reveal a one letter code. Enter these codes in alphabetical order into Certitude and you will be given the final location.
Please use stealth at the final location to preserve the longevity of the cache.
https://labs.geocaching.com/goto/MINDARIE
A suggested route for the series on bike or foot can be found in the gallery.
UPDATE 24/3/23 - original cache compromised. Moved slightly. Certitude has the new solution otherwise add 1 to the southing and take 6 off the easting. You are now looking for a simple bison.
UPDATE 18/5/23 - new loaction is no more! Cache is with a few meters. Certitude has the new correct soluton.
You can validate your puzzle solution with certitude.