Guide
Left Bank and Right Bank: the rule, and where it breaks
Cabernet on gravel, Merlot on clay. True often enough to teach, and wrong often enough to catch you out.
The short answer
Left Bank means the gravel south and west of the Gironde and the Garonne, where Cabernet Sauvignon leads the blend. Right Bank means the clay and limestone north of the Dordogne, where Merlot leads. The ground decides the grape, not the river, which is why the rule breaks where the ground changes.
Left and right of what
Of 2 rivers, not 1, which is the first thing nobody explains. The Garonne comes up from the south and the Dordogne comes in from the east; they meet just north of the city and run to the sea as the Gironde. The Left Bank is the left side of the Garonne and the Gironde: the Médoc going north, Graves and Sauternes going south. The Right Bank is the right side of the Dordogne and the Gironde: Saint-Émilion, Pomerol, Fronsac, Bourg and Blaye. Between the 2 rivers is Entre-deux-Mers, which is neither and says so in its name.
The rule
| Left Bank | Right Bank | |
|---|---|---|
| Ground | Gravel, deep, over clay | Clay and limestone, sand at the foot |
| Leading grape | Cabernet Sauvignon | Merlot |
| Ripens | Late, needs the warm stones | Earlier, on cooler ground |
| Typical names | Pauillac, Margaux, Saint-Julien, Saint-Estèphe, Pessac-Léognan | Saint-Émilion, Pomerol, Fronsac |
Gravel holds the day’s heat and drains hard, which suits a late grape with thick skins. Cold wet clay does not, and Merlot, which flowers and ripens earlier, gets home on it. That is the whole mechanism, and the river is only where the geology happens to change.
Where it breaks
It breaks on the Right Bank whenever there is gravel. Château Figeac and Château Jean Faure sit on the sandy gravel where Saint-Émilion runs into Pomerol, and both are planted mostly to Cabernet: Jean Faure is 65% Cabernet Franc, which is not how Saint-Émilion is usually planted at all.
It breaks on the Left Bank whenever the wine is not red. The classified growths of the Graves are ranked for red, for white or for both, and the greatest sweet wines in France are made on the Left Bank at Sauternes and Barsac, from grapes the Médoc does not grow.
And it breaks as a matter of arithmetic on any estate you care to open: a Médoc classified growth is Cabernet-led, but Merlot is in nearly all of them, and in a cold year it is Merlot that fills the middle of the wine.
What to do with the rule
Use it as a first guess and drop it the moment the ground contradicts it. The useful question is never which bank, it is what is under the vine.
Where to go next
Sources: FGVB, cahier des charges Pauillac · INAO, Pomerol