Tornio (tôrˈnēō) [key], Swed. Torneå, city (1996 pop. 23,285), Lapland prov., NW Finland, at the mouth of the Torneälv on the Gulf of Bothnia. It is a trade center and export point for forest products. It was chartered in 1621 and has the oldest extant wooden church (1684) in Finland.