Coonawarra is the region I recommend to people who tell me they "don't get" Australian red wine. It's a strip of countryside on South Australia's Limestone Coast — barely 20 kilometres long and 2 wide — that produces Cabernet Sauvignon with more personality per hectare than almost anywhere else in the country. But it's remote, and you need to know what you're signing up for before you point the car south.

First, the famous dirt. Terra rossa gets talked about in hushed tones, so here's the plain-English version. It's a shallow band of vivid red-brown soil — literally "red earth" — sitting on top of a thick slab of soft white limestone. The red topsoil is free-draining, so vines never sit with wet feet, but the limestone underneath holds moisture like a sponge and stays accessible to the roots. The result is vines under just enough stress: they don't grow lush and lazy, they work for their water, and they put their energy into small, concentrated berries instead of leaves. That combination — good drainage above, steady moisture below, in a strip you can walk across in twenty minutes — is genuinely rare. You can see the boundary with your own eyes: on one side of a road the soil is red and planted to vines, on the other it's black and grazing sheep. I make every tour group get out of the bus and look, because no amount of wine-speak explains it as well as the dirt itself.

Why does Coonawarra Cabernet taste different? Climate does the rest of the work. It's a cool, maritime-influenced region — much cooler than most people expect from South Australia — with a long, slow ripening season. That gives you Cabernet with genuine structure: firm but fine tannins, blackcurrant rather than jammy plum, and that signature note people describe as mint, eucalyptus, or dried herbs. Where Barossa reds hug you, Coonawarra Cabernet stands up straight. These are wines built to age — a good vintage will reward fifteen or twenty years in the cellar — and even the entry-level bottles have a savoury edge that makes them brilliant with food rather than just on their own.

Cellar doors: the classics earn their reputations. Wynns Coonawarra Estate is the essential stop — the triple-gabled building on the label is right there, the museum tastings are excellent, and their Black Label Cabernet remains one of Australia's great value age-worthy reds. Balnaves does a superb structured tasting if you want to understand the region properly. Majella is friendly, unpretentious, and consistently over-delivers for the price. Rymill and Katnook are worth your time, and Zema Estate still hand-prunes, which tells you something about their attitude. Because the region is one straight road — the Riddoch Highway — you can comfortably do five or six cellar doors without any complicated navigation. Book ahead for the structured experiences; walk-ins are fine at most others midweek.

Now the honest bit: getting there. Coonawarra is about 380 kilometres from Adelaide — a four-hour drive — and roughly 430 kilometres from Melbourne, call it four and a half to five hours. It is not a day trip from anywhere. The smart play is to build it into an Adelaide-to-Melbourne road trip via the Limestone Coast and Great Ocean Road, staying a night or two in Penola, the little town at the region's edge. Penola punches above its weight for food and has genuine history (Mary MacKillop territory, for those interested). Combine Coonawarra with nearby Padthaway or the Mount Gambier sinkholes and you've got a proper two-day leg. Come in autumn if you can — vintage energy, red vines, and the cool air that made these wines what they are.