To get to Cadarnoxo waterfall, take the DP-1105 road from Boiro to Noia and, at Moimenta, turn off towards EVA-10 (Air Monitoring Area). After roughly 500m you will find directions to the waterfall and you can practically drive all the way to it because it is next to the road, so you need only walk a short distance. 

In Cadarnoxo you can see the River Graña, a tributary of the River Coroño, plunging onto granite rocks from a height of roughly 30m.