The initial section until Unhais-o-Velho coincides with all the other circuits, this route continues a bit more together with P20, and splits to follow up Unhais river, towards Meãs village where enter an old valley trail. Leave this section by climbing steep and then contouring the side of the mountain to Malhada do Rei. Now climb to the route's highest point (1023m) with spectacular views over the dam reservoir. Contour the mountain crest to have a view over Fajão Schist village and rocky crest (Natura 2000 conservation area) and downhill towards Vidual de Cima, where is possible to short cut to P18 or continue to Cabril and Vale Grande. From here there is an incredible view to the cliffs where the dam was built and where the route pass over to the end.