The Muonio River is a river located in northern Finland and Sweden. It serves as a natural border between the two countries and flows into the larger Tornio River. The river is approximately 100 kilometers long and is known for its clear waters and beautiful surroundings. The Muonio River is popular for various outdoor activities, including fishing and canoeing. It is home to several species of fish, such as trout and grayling, making it a favored spot for anglers. The river's scenic landscape attracts nature enthusiasts and tourists throughout the year.