Located in central Italy along the Tyrrhenian coast, Tuscany is home to some of the world's most renowned wine regions. With a rich history dating back to Etruscan times, wine making has been celebrated in local literature and art throughout all significant periods of the region. Boasting hilly terrain and a warm, Mediterranean climate, Tuscany has ideal growing conditions for grapes, the most notable of which is the Sangiovese variety. Soil composition ranges from hard and stony, to rich in clay. The majority of the region's vineyards are found at altitudes of 150–500 metres, as the grapes perform better when they receive direct sunlight. The higher elevations also increase the daily temperature variation, helping the grapes maintain their balance of sugars and acidity as well as their aromatic qualities. Tuscany has many notable wines, the most famous being Brunello di Montalcino, Vino Nobile di Montepulciano, Carmignano, and of course Chianti and Chianti Classico. In the 1970s, high quality wines made outside of DOC/DOCG regulations called “Super Tuscans” emerged. These wines commanded high prices and have since become world-renowned. As the trend of creating high quality non-DOC wines spread to other regions of Italy, the classification system was modified in order to include Super Tuscans as DOC/DOCG Chianti. Many producers have adopted these classifications, though some producers still prefer to use the less-restrictive IGT classification Toscana.