09-Feb-2013 -- Thanks to satellite imagery, plus reports from previous visitors, I knew that I should approach this confluence point from the south (from the town of Nelson, Victoria - just across the border from South Australia). I also followed Jeremy Porter and Phil Williams' advice to park at [38.00392S,141.01352E], because a track starting there leads partway to the confluence point. Fortunately my rental car was able to make it along the often sandy road leading north from Nelson through the Lower Glenelg National Park.
From my parking spot, I had about a 1.2 km (each way) hike to the confluence point. Fortunately the existing track (really a road) took me to within about 800 metres, before it turned southwards. At this point I had to hike through the forest the rest of the way. I had prepared beforehand by wearing long pants and boots, expecting dense vegetation. Actually, though, the vegetation throughout most of the hike was not particularly dense; there were several clearings and old tracks in the area that made hiking quite easy. The confluence point itself lies on a partially-overgrown old track.
After I'd taken my photos, my GPS receiver's batteries suddenly died. Fortunately, however, I was able to find my way back to my car using my iPhone's "compass" tool, plus the GPS logger on my digital camera. In the future, however, I'll need to make sure that I have spare batteries for my GPS receiver before starting a long confluence hike!