Tornio River is the longest free-flowing river in Europe. Salmon is free to rise to more than 500 kilometers long border river. The river also provides a grayling, pike, whitefish, perch and trout.

Muonio River is a tributary of the River Tornio. The length of the Muonio River is 230 kilometers.

Famous rapids are Kukkolankoski, Matkakoski, Vuennonkoski and Äijäkoski.