France's longest river is the Loire, which is 5 letters long. It is located in central France and is the longest river in the country. It is 1, 012 km (629 mi) long and flows from the Massif Central mountains to the Atlantic Ocean. The Loire River is an important source of hydroelectric power and is also used for transportation and irrigation. It is also a popular tourist destination, with many castles and vineyards along its banks.