The Spanish are the world's greatest wine growers with a total of 1.2 million hectares of vineyards. They are also the producers of the most white wine in the world, although red and white wines are grown in equal measure. These wines include traditional white wine varieties such as Airen, as well as internationally successful grapes such as Chardonnay. Red varieties include the Tempranillo variety, as well as Monastrell, Bobal and Grenache as the most important grapes. The size of the country, which spans 3 climate zones, offers the best conditions for the diversity of Spanish wines, which range from light, fruity white wines to heavy, rich red wines. The Ancient Romans knew to treasure Spanish wine, as discoveries of Ancient amphoras in the Italian capital prove. As part of provisions, the Romans helped Spanish wine to reach as far as Brittany, Normandy and even England.