Regions (in descending order of acreage-320,000 acres total)
Central Valley
Aconcagua Region
South Region
Coquimbo Region
Others
Chilean wine is divided by regions and then sub-divisions of valleys. Given Chile’s unique geography flanked on one side by the Andes mountain range and the other by the coastal mountain range, you have an extremely long stretch of coast line, valleys, and mountains in which to grow grapes. One way to categorize the wines is this way:
Coastal Regions: Cool climate varietys
Inland Valleys: Warm climate varietys
Mountains: Bolder wines
However, since many of the valleys stretch from the coast across the valley to the mountains, you can also think of the wine regions going North to South from a desert climate that requires irrigation to grow grapes all the way to Maule, Itata and Bio-Bio, where it’s wet and cool enough to do dry-farming, and finally down to the much cooler northern part of Patagonia (Austral region). The Austral and Atacama regions are still just in the exploratory stages of production while the Maule Valley and further south to Itata are areas with a lot of up and coming independent growers making all types of varieties.
Regions & Valleys (North to South with what typically grows where)
Atacama Region
Copiapó Valley: Various Grapes
Huasco Valley: Various Grapes
Coquimbo Region (also famous for Pisco)
Elqui Valley: Syrah, Sauvignon Blanc, Pedro Ximenez, Muscat (Moscatel)
Limarí Valley: Chardonnay, Pinot Noir, Syrah, Muscat
Choapa Valley: Carmenere, Syrah, Cabernet Sauvignon
Aconcagua Region
Aconcagua Valley: Cabernet Sauvignon, Carmenere, Syrah, Pinot Noir, Sauvignon Blanc, Chardonnay
Casablanca Valley: Sauvignon Blanc, Chardonnay, Pinot Noir, Syrah, Merlot
Leyda Valley: Sauvignon Blanc, Chardonnay, Pinot Noir
San Antonio Valley: Sauvignon Blanc, Chardonnay, Pinot Noir
Central Valley Region
Maipo Valley: Cabernet Sauvignon, Merlot, Cabernet Franc, Carmenere
Rapel Valley: This appellation encompasses both the Cachapoal and Colchagua Valleys
Cachapoal Valley: Carmenere, Cabernet Sauvignon, Viognier
Colchagua Valley: Carmenere, Cabernet Sauvignon, Syrah, Sauvignon Blanc
Curicó Valley: Cabernet Sauvignon, Merlot, Carmenere, Chardonnay
Maule Valley: Pais, Carignan (often labeled VIGNO), Merlot, Cabernet Franc, Garnacha (Grenache), Cabernet Sauvignon, Malbec, Syrah, Cinsault, Chardonnay, Sauvignon Blanc, Carmenere, others
South Region
Itata Valley: Pais, Cinsault, Muscat, Cabernet Sauvignon,
Bío-Bío Valley: Chardonnay, Pais, Muscat, Pinot Noir, Cabernet Sauvignon
Malleco Valley: Chardonnay, Pinot Noir
Austral Region
Cautin Valley: Pinot Noir, Chardonnay
Osorno Valley: Pinot Noir, Chardonnay
Map taken from Winefolly via: https://www.thewellessentials.com/blog/chilean-wine-regions-a-guide-to-the-best-vineyards-wineries-hLops
For more information about the different terroir in Chile: https://youtu.be/rKr3EnJl1uA