Leaving the centre of Ortigueira, take the AC-862 road to A Ponte de Mera then continue on the DP-6121 road to Serantes in Santo Adrao de Veiga parish.

Follow the signs from there towards O Casón/Castelo and 200m on an arrow guides you towards Pozo do Inferno. You can drive to the Castelo Casón car park and leave your car there and then walk the hiking trail that also leads to the Casón waterfall. This is quite a seasonal waterfall, so it almost dries up in less rainy periods. 

The Pozo do Inferno waterfall flows all year round and has a wooden bridge that gives you the chance to get closer and even watch it pass under your feet.