Vouvray (wine) towards drier styles of wine including sparkling Vouvray. More warmer climate years promote the production of sweeter, dessert style wines. The northern location and relatively cooler climate combines to make harvest in Vouvray one of the last to completed in France, often lasting into November. Vineyards are usually planted on the plateau above the river bank in soils composed of gravel and clay on top of tuffeau. Chenin blanc is the dominant and nearly exclusive grape of Vouvray. While the obscure minor grape Arbois is permitted in the Vouvray AOC, it is rarely seen. With more than 5,000 acres (2,000
Loire of losing its status as the last wild river in France". The reason for this is its sheer length and possibility of extensive navigation, which severely limits the scope of river conservation. The Federation, a member of the IUCN since 1970, has been very important in the campaign to save the Loire river system from development. In 1986, the French government, the Loire-Brittany Water Agency and the EPALA settled an agreement on flood prevention and water storage programme in the basin, involving construction of four large dams, one on the Loire itself and three on the Allier and Cher. The