This 6 km circular route is one of the most beautiful hikes in Parque Natural das Serras de Aire e Candeeiros (PNSAC).
It takes you into ancient burial caves, through a natural tunnel and round to Malhadouro valley, where you'll climb some natural stairs that will lead you to Pia da Ovelha, a large natural cave, which owes its name to the sink built there under a stalactite and which drips abundantly in the rainy season, serving as a water hole for the sheep (ovelhas) in the old days.
Via roped stairs you get to the bottom of the valley, from where you can watch the climbers on Reguengo do Fetal Climbing area on a good day.
You'll then ascend the other side of the valley, up to the fertile plain before descending Vale da Pena. Here, you'll get the chance to observe the rock formations again on your way back, before reaching your point of departure in Reguengo do Fetal.
Read more about the trail here: