The river level increases dramatically in the winter with rainfall, but swimming is not permitted even when the river levels are low due to strong currents. The Loire Valley is defined as the central 280-kilometre section of the river stretching from Sully-sur-Loire in the east to Chalonnes-sur-Loire in the west. This section was granted UNESCO World Heritage Site status in 2000.
The region has a generally mild climate, cool in spring and wet in autumn, with warm breezy summers. The undulating land close to the river includes many significant wine-producing regions and so miles and miles of vineyards make up the landscape. The Valley crosses two administrative regions, Centre and Pays-de-la-Loire.