Paul de Arzila is a Portuguese natural reserve occupying an area in Coimbra municipality, and neighbouring municipalities of Condeixa-a-Nova and Montemor-o-Velho. It is a biogenetical reserve with an area of 150 ha framed in a protected area of 535 ha, where 119 species of birds, 12 of mammals, 10 of reptiles, 13 of fish and 201 of spiders were inventoried.