side of the Douro river after 1035, with the exodus or expulsion of the Muslim populations, leaving behind semi-abandoned fertile lands, colonists from the north settled in exchange for better feudal contracts with the newly appointed lords. These migrants refounded the old city of Cale or Gaia under the name of Vila Nova de Gaia (new town of Gaia) around the old castle and ruins of "old Gaia". The name of the double city of Porto and Gaia was frequently referred to in contemporary documents as "villa de Portucale", and the county of the Kingdom of León which was centered on it was named Condado Portucalense. This county was eventually expanded and after gaining its independence, became the Kingdom of Portugal. Parishes Administratively, the municipality is divided into 15 civil parishes (freguesias): The parish Santa Marinha e São Pedro da Afurada contains the city centre of Vila Nova de Gaia. Coat of arms and flag The coat of arms consists of a grey crest with two golden-yellow bunches of grapes on the bottom with a black castle over the water, and with a person blowing the horn. The grapes intend to represent the city's connection with the wine industry, mainly Port wine, whose cellars are in the lower part of the city. The flag features the coat of arms on a field of eight wedges (gyronny) of alternating dark yellow and black, beginning with the north-northeast octant. Leisure Beaches Vila Nova de Gaia is the Portuguese municipality with the highest number of Blue Flag beaches in 2009 and in 2010: 17 beaches along 17 km of seaside. Some popular beaches are: Miramar, Granja, Aguda, Valadares, Francelos, Madalena and Canidelo. Praia da Granja is a FEE Blue Flag beach in the parish of São Félix da Marinha. This area was a farm in the 18th century belong to the Grijó Monastery and used as a rest place of monks and priests. Parks and gardens Gaia Biological Park () is the largest park in the city, with an area of 35 hectares. The Park established in 1983 as an environmental education center, features a 3 km walkway along with hundreds of species of animals and plants. Opened in August 2005, the Lavandeira Park () is a place for leisure activities with a lake, pedestrian walks, picnic areas and theme gardens. It has an area of 11 hectares located in Oliveira do Douro.