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WINE REGIONS
Chile is a long, narrow country that is geographically and climatically dominated by the Andes to the east and the Pacific Ocean to the west. Chile's vineyards are found along an 800-mile stretch of land from Atacama Region to the Bio-Bio Region in the south. The climate is varied with the northern regions being very hot and dry compared to the cooler, wetter regions in the south. In the Valle Central around Santiago, the climate is dry with an average of 15 inches (38 centimeters) of rain and little risk of springtime frost. The proximity to the Dry Andes help create a wide diurnal temperature variation between day and nighttime temperatures. This cool drop in temperature is vital in maintaining the grapes' acidity levels.[8] Most of Chile's premium wine regions are dependent on irrigation to sustain vineyards, getting the necessary water from melting snow caps in the Andes. In the developing wine regions along the Coastal Ranges and in the far south, there is not a lack in needed rainfall but vineyard owners have to deal with other factors such as the Humboldt Current from the Pacific which can bathe a vineyard with a blanket of cool air. For the rest of Chile's wine regions, the Coastal Ranges serve a buffer from the current and also acts as a rain shadow. The vineyards in these regions are planted on the valley plains of the Andes foothills along a major river such as the Maipo, Rapel and Maule Rivers.[8] The vineyards of Chile fall between the latitudes of 32 and 38° s which, in the Northern Hemisphere would be the equivalent of southern Spain and North Africa. However the climate in Chile's wine regions is much more temperate than those regions, comparing more closely to California and Bordeaux. Overall, it is classified as a Mediterranean climate with average summer temperatures of 59–64 °F (15–18 °C) and potential highs of 86 °F (30 °C).[5]
ATACAMA REGION
Named after the Atacama Region administrative territory, this region is divided into two valleys, Copiapó and Huasco, both of which are coterminous with the provinces of the same names. The region is known primarily for its Pisco and table grapes, but in the 1950s wine began to be produced on a small scale around Copiapó. Examples of wine from these valleys include "Vino Copiapino" (literally, "Copiapó's Wine") by Viña Fajardo and Pajarete wine, a varietal from Spain that is now produced successfully in the Huasco Valley.
COQUIMBO REGION
The Coquimbo Region contains three wine-producing sub regions: Elqui, Limarí and Choapa, all are coterminous with the provinces of the same name. The region's vineyards extend from the Pacific Ocean in the west to the Andes Mountains in the east, rising to an altitude of 2,000 m.a.s.l. (6,500 feet). Wine production began in the Elqui Valley in the 1990s when Chilean wine producers began to look at potential viticulture sites outside the Chilean Central Valley.
ACONCAGUA REGION
The administrative region of Valparaíso contains two wine-producing subregions, the Aconcagua and Casablanca valleys. The Aconcagua Valley is coterminous with the province of San Felipe de Aconcagua Province while the Casablanca Valley is coterminous with the commune of that name. The Panquehue commune is also gradually developing a reputation for high quality wine production.
CENTRAL VALLEY REGION
The Central Valley spans the O'Higgins (VI) and Maule (VII) administrative regions as well as the Metropolitana Region. Within it are four subregions: the Maipo Valley, the Rapel Valley, the Curicó Valley and the Maule Valley. This is Chile's most productive and internationally known wine region, due in large part to its proximity to the country's capital, Santiago.
SOUTHERN REGION
Lying within the Ñuble and Bío Bío Administrative Region, this area includes three wine-producing sub regions: the Itata Valley, the Bío Bío Valley and the Malleco Valley. The region is primarily known for its mass-produced boxed Pais wine and jug wines, though the Concha y Toro Winery has experimented with Gewürztraminer from this region. Chile's southern wine regions have more rainfall, lower average temperatures and fewer hours of sunlight than the northern wine regions.
