The Loire is a long river in France, stretching over 1000 kilometers from its source in the Massif Central to its mouth in the Bay of Biscay. It is the longest river in France and the second longest in Europe after the Volga. The Loire is known for its many tributaries, including the Allier, Cher, Indre, and Vienne rivers. It is also home to numerous castles, vineyards, and other historical sites.