The Torne, also known as the Tornio , is a river in northern Sweden and Finland. For approximately half of its length it defines the border between these two countries. It rises at Lake Torne near the border with Norway and flows generally southeast for a distance of 522 kilometres into the Gulf of Bothnia. It is the largest river in Norrbotten both by length and by watershed area.
The Torne basin has a total area of 37,300 square kilometres or 40,147.1 square kilometres . Of this, 25,392.2 km2 or 25,393.1 km2 is in Sweden, 10,400 km2 or 14,266.3 km2 is in Finland and 1,500 km2 or 497.7 km2 is in Norway.
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