The soils on the Left Bank of Bordeaux are predominantly gravel based in the best terroirs, which include Médoc, Margaux, Pessac-Léognan, and Pauillac. Of course the soils are not only created from gravel, the various types and sizes of stones resting on beds ranging from limestone, to clay, to sandstone, and other mineral and organic materials play an important role. The gravel soils allow excellent drainage, encourage the roots to burrow deep, help by reflecting sunshine, and radiate heat (which helps the grapes to fully ripen).

Château Bel-Air Marquis d'Aligre is currently working 5 hectares of vines in Margaux appellation, while the remaining plots are rented to famous neighbours. Jean-Pierre Boyer took over with the 1950 vintage and is since then the last standing man in Bordeaux making old fashion, traditional wines. The blend is 35% Merlot, 30% Cabernet, 20% Cabernet Franc and also Petit Verdot, Malbec, Carmenere.