Paul de Arzila (Arzila Bog) is a Portuguese natural reserve occupying an area in Coimbra municipality (in Arzila), 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.

Paul de Arzila Nature Reserve
IUCN category IV (habitat/species management area)
Location	Coimbra, Portugal
Coordinates	40°10′17″N 8°33′21″W / 40.17139°N 8.55583°W / 40.17139; -8.55583
Area	5.87 km2 (2.27 sq mi)[1]
Established	1988
Governing body	ICNF
Ramsar Wetland
Official name	Paúl de Arzila
Designated	8 May 1996
Reference no.	822[2]