A university dated this oak in 2011 and it came back the oldest of its species anywhere on the Iberian Peninsula, over 500 years old. The parish of Calvos built a visitor centre around it in 2005, before the dating even confirmed what everyone already suspected. It has since been a national Tree of the Year finalist twice, in 2019 and 2025, and it hosts a protected stag beetle in its crater of a base.
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The Carvalho de Calvos
Pedunculate Oak (Quercus robur) · over 500 years · Calvos, Povoa de Lanhoso, Braga district
A tree does not usually get a verdict from a university, but this one did. In 2011 the University of Coimbra's Centre for Functional Ecology dated the Carvalho de Calvos at over 500 years old, and reported it the oldest Pedunculate Oak anywhere on the Iberian Peninsula. The municipality had already built a visitor centre around it six years earlier, in 2005, betting on a tree everybody locally already believed was ancient.
The trunk explains the bet. It widens at ground level into what locals describe as a crater, a mass of buttressed wood that two official sources measure differently depending on where they wrap the tape: 10 metres round at breast height, or 11.5 metres at the base. Both figures come from the tree's own public-interest registration rather than a guess, and the difference is a matter of where the trunk was measured rather than a disagreement about the tree. That hollow, crater-like base now shelters the stag beetle, a species protected under Portuguese law.
Designated a tree of public interest on 22 August 1997, it has survived disease, fire and old amputated branches, and gone on to place as a national Tree of the Year finalist twice, in 2019 and 2025. Marked trails now run around it, inside the interpretation centre built for exactly this purpose.
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