With a bit of scrambling over the rocks (be careful, one spot is greasy/slippery due to lots of hikers!) you can get to this point to see the waterfall.
Viewpoint in the heart of the Corbières-Fenouillèdes Regional Natural Park, on the GR 36 route. Below, you can see the very impressive Termes castle, which is in ruins and overlooks the Sou valley.
This access, as close as possible to the water, allows you to admire one of the spectacular sections of the Terminet gorges, from the bottom of the canyon.