29-Nov-2014 -- Although this confluence point was quite close to Margaret River, where I was staying the night, and appeared easy, I was unusually apprehensive about visiting it, because of the warnings - from some of the previous visitors - about venomous snakes possibly lurking in the vegetation here. (Being originally from New Zealand - where there are no snakes at all - I have what is perhaps an irrational fear of encountering snakes, especially here in Australia.)
Fortunately, however, I didn't run into any snakes during the short (~40 m each-way) hike. The confluence point lies in dense vegetation about 3 m tall, so my north-east-south-west photos were all pretty much the same.
Here is a remote-controlled aerial video of this confluence point.