The Dolmen Chan da Arquiña is a dolmen north of Moaña, on the peninsula do Morrazo, in the Spanish border province of Pontevedra in southwest Galicia.
The approximately 5000-year-old complex is characterized by the huge capstone that served as a cover for the chamber. 11 erected stones form a polygonal chamber, which is covered with the large stone slab. Sometimes, as in this case, the dolmens have a preserved passage area that faces east. The rest of the hill, known in Galicia as Mámoa, has also been preserved. In Galicia, almost all dolmens were probably destroyed in search of "treasures". That coined the term “Mamoa violada”. Chan da Arquiña is one of the better-preserved structures. The dolmen was excavated in 1953, and axes and broken pottery were found.