Serras de Aire e Candeeiros Natural Park (PNSAC) is a natural park in central west Portugal. It occupies an area of 383.9 km2 (148.2 sq mi) and is the most important repository of limestone formations in Portugal with a variety of geological formations associated with karst topography such as caves, sinkholes, uvalas, poljes, limestone pavements, ponors, among others. It was made a protected area in 1979 with the intend to protect the existing natural aspects and the architectonic and cultural heritage linked to the local populations.

Alcobaça is a Portuguese city and municipality in the Oeste region, in the historical province of Estremadura, and in the Leiria District. The city grew along the valleys of the rivers Alcoa and Baça, from which it derives its name. The municipality population in 2011 was 56,693, in an area of 408.14 square kilometres (157.58 sq mi). The city proper has a population of 15,800 inhabitants.