Caldas da Rainha (Portuguese pronunciation: [ˈkaɫdɐʒ ðɐ ʁɐˈiɲɐ]) is a medium-sized city in western central Portugal in the historical province of Estremadura and the district of Leiria. The city serves as the seat of the larger municipality of the same name and of the Comunidade Intermunicipal do Oeste (OesteCIM, Intermunicipal Community of the West). At the 2011 census, the municipality had a population of 51,729 in an area of 255.69 square kilometres (98.72 sq mi), with 27,378 residing in the city. Although the city itself lies about 10.5 kilometres (6.5 mi) inland, three of the municipality's civil parishes lie on the Atlantic Ocean.