Lisbon has most trees of public interest, but the Algarve has the Pedras d'el Rei olive tree
Among the “living monuments” of Portugal are the Calvos oak (Póvoa de Lanhoso), the Pedras d'el Rei olive tree (Tavira), the ash boulevard (Marvão), the rhododendron massif (Vouzela) and the olive tree do Mouchão (Abrantes)