Tornio (Official name: Tornion kaupunki; in Northern Sami: Duortnus; in Swedish: Torneå) is a town and municipality in Lapland, Finland. The municipality covers an area of 1,348.55 square kilometres (520.68 sq mi) of which 161.59 km (62.39 sq mi) is water. The population density is 18.99 inhabitants per square kilometre (49.2 /sq mi), with a total population of 22,546 (31 January 2011). It borders to the Swedish municipality of Haparanda (in Finnish: Haaparanta). Tornio is unilingually Finnish.