This dolmen is the "Anta de Mezio" proper, right along the road N.202 and next to an Information Center.
There are five such informations centres around the Parque Nacional de Peneda-Berês, called Portas ("Gates") : Lamas de Mouro, Mezio, Lindoso, Campo de Gerês and Montalegre.
Something is not right. This message is just to keep things from messing up down the road