The Allier is a river in central France, flowing through the Auvergne region. It is approximately 400 kilometers long and is a tributary of the Loire River. The river is known for its scenic landscapes, including valleys and forests, making it a popular destination for outdoor activities like hiking and fishing. The Allier also plays a significant role in the local economy, supporting agriculture and tourism. Several towns, such as Vichy and Moulins, are located along its banks, offering cultural and historical attractions. The river's waters are also famous for their therapeutic properties, particularly in Vichy.