Kaarina, or S:t Karins in Swedish, is a small city and municipality of Finland.
It is located in the province of Western Finland and is part of the Finland Proper region. The municipality has a population of 21,568 (2004-12-31) and covers an area of 60.59 km² (excluding sea) of which 0.89 km² is inland water. The population density is 361.27 inhabitants per km².
The municipality is unilingually Finnish.
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