Located on the site of Portela do Carrazedo, near the village of Arcas, this monument was renovated in the late 1950s. XX by Albuquerque e Castro (Castro, 1958) and in 1999 by a team of archaeologists from the company Arqueohoje, Lda (Santos et alii, 2001 and 2010-2011). These studies allow us today to characterize this tomb as a dolmen with a polygonal chamber elongated, sub-trapezoidal configuration.

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With 11 pillars and a medium-sized corridor measuring 3.90 m in length. Little different in plan and elevation, this dolmen still has 5 pillars preserved in the chamber and 14 in the corridor. The well-preserved mound is 18 m in diameter on the east/west axis and 17.40 m on the north-south axis.

It is, therefore, a monument with unusual architectural features in regional megaliths. The 1999 intervention allowed uncovering the structures in the area bordering the corridor that indicate complex funeral rituals in this space

The loot in this exhumed dolmen is archaic and reduced, consisting of microliths, blades, axes and a few ceramic fragments. This artifactual set indicates an ancient moment of megalithism that will be around the end of the 5th millennium (about 6,000 years).

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Another peculiar aspect of this monument was the finding of a granite stone by Albuquerque e Castro inside the burial chamber with 13 cavities in the shape of sphere caps (Castro, 1958). The functionality of this piece, unique of its kind for now, must certainly be linked to rituals that took place inside the monument.

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This monument can be visited through the pedestrian route “Rota do Megalithic” (PR5)