Bordeaux to Le Biac in Langoiran: fortress, vineyards and Garonne

Le Biac is a wine-growing hamlet in the municipality of Langoiran, not an independent municipality. Situated on a hillside on the right bank of the Garonne River, it consists of a few houses and the Château Biac estate. People come here for the vineyards and the panoramic view of the valley, while the main attractions are located in Langoiran. ^{[Ville de Langoiran 2022]}

The name is actually somewhat misleading. Le Biac primarily refers to Château Biac, an estate with a well-documented history: it is said to have been built in 1755 by the daughter of the Baron de Langoiran, on the hills overlooking the valley. ^{[Château Biac 2026]}The vineyard, classified under the Cadillac-Côtes de Bordeaux appellation, produces red wines, a dry white, and a sweet wine; it has been run by the Asseily family since 2006, who have brought it back into the spotlight. According to sources, the estate covers between nine and fifteen hectares—a manageable-sized property, carved into the hillside. It is this very château—thriving and full of life—that has made the name Biac known far beyond the borders of Langoiran.

A hamlet on a hillside, not a village

Le Biac must be taken for what it is: a rural hamlet with no town hall, no town square, and no shops. Its administrative affairs are handled by Langoiran, on which it depends entirely. This is by no means unusual in Gironde, where countless hamlets—often linked to an estate or a former farmstead—dot the vineyards without ever forming a town. What makes Le Biac so endearing is precisely this unassuming nature: people come here for the vineyards, the light, and the horizon—not for a shopping street. The true architectural heritage, meanwhile, lies a little further down, in Langoiran itself, between the river and the hillsides. Le Biac is the realm of the vineyards; Langoiran, that of the monuments. In Gironde, hamlets like this often take their identity from a single house, a wine cellar, or a path lined with vines; in Le Biac, it’s the view that makes the difference—that sweeping panorama of the Garonne’s bend, which you’d never suspect from the road below. People come up here to breathe and to look around, just as much as to taste the wine.

Château Biac, an estate founded in 1755

Château Biac is one of the main reasons to visit the hamlet. Founded in the mid-18th century, it reflects the winemaking history of these early slopes along the Garonne, where vines were planted on the best-exposed sites, facing south and overlooking the river. The Asseily family has run it since 2006 and restored its reputation through meticulous production of both red and sweet wines within the Cadillac-Côtes de Bordeaux appellation. As is the case throughout the region, visits and tastings must be arranged in advance and are subject to the estate’s availability: it’s best to contact them before heading out, rather than hoping to find the door open by chance. And above all, do not confuse this Château Biac—which is active and inhabited—with the fortified castle of Langoiran, which is now nothing more than a medieval ruin—two monuments that are polar opposites in every way, starting with their purpose and the era in which they were built.

Le Biac or Graves? A Misunderstanding to Clear Up

It is sometimes stated that Le Biac is located “on the Graves plateau.” This is a geographical error. The Graves region stretches along the left bank of the Garonne, south of Bordeaux; Le Biac, on the other hand, is located on the right bank, right in the heart of Entre-deux-Mers, within the Cadillac-Côtes de Bordeaux appellation. The river clearly separates the two regions: in Langoiran, one need only look across to the opposite bank, toward Portets, to see where the Graves region begins. For a wine lover, this distinction is no mere detail: it shapes the soils, the dominant grape varieties, and the style of the wines. Le Biac is unmistakably a right-bank terroir, and confusing it with the Graves is like crossing the river by mistake.

Langoiran and Le Biac are part of the Cadillac-Côtes de Bordeaux wine region, an appellation on the right bank of the Garonne. On these sun-drenched hillsides, vineyards reign supreme: they cover a large part of the region and shape the rolling hillside landscape that gives the town its charm. Red wines are the main production here—the Cadillac-Côtes de Bordeaux appellation is now renowned for them—but the region is also home to white wines, both dry and, above all, sweet. This dual character is one of the keys to the local terroir: a single village can offer both a red for the meal and a white for dessert.

For there is another Cadillac: the “Cadillac” appellation itself, reserved for sweet white wines. It belongs to the prestigious circle of great sweet wines from Bordeaux. On the left bank, Sauternes, Barsac, and Cérons shine; on the right bank, facing them, Loupiac, Sainte-Croix-du-Mont, and Cadillac hold their own. Langoiran lies at the heart of this region of sweet wines, where the morning mists of the Garonne encourage noble rot—the famous botrytis that concentrates sugars and produces the great sweet wines. It is a versatile terroir, capable of producing both full-bodied reds and golden whites: enough to offer, right there on the spot, a beautiful journey through the styles of Bordeaux.

Cadillac, a great sweet Bordeaux wine

Cadillac sweet wines are well worth exploring. Made from overripe grapes concentrated by botrytis, they share the same ambition as their illustrious neighbors: to offer a rich, long-finishing golden wine with notes of candied fruit and honey. Long overshadowed by Sauternes, the sweet wines of the right bank—Cadillac, Loupiac, Sainte-Croix-du-Mont—now offer a value for money that appeals to discerning wine lovers. Tasting them on site, facing the hillsides where they were born, naturally adds to the pleasure. It’s also an opportunity to understand, glass in hand, why this stretch of the Garonne is home to so many sweet wine appellations within such a short distance.

Château Biac and Château Langoiran: two signature estates

Two estates are particularly representative of the local vineyards. Château Biac, situated on the heights of Biac, produces a range of wines—from reds to sweet wines—within the Cadillac-Côtes de Bordeaux appellation; as mentioned earlier, its history dates back to 1755. Château Langoiran, operated by Vignobles Gonfrier, covers about twenty hectares—roughly 23 hectares—and overlooks the Garonne Valley. These two estates illustrate the diversity of a terroir where each hillside has its own exposure, soil, and style. As always, tastings and tours should be scheduled in advance, depending on the estates’ availability: a quick call before arriving helps avoid disappointment and often ensures a warmer welcome. Another benefit of an on-site tasting is understanding the connection between the landscape and the wine in your glass: seeing the slope, the exposure, and the proximity to the river, then tasting the wine produced there. That’s where the Langoiran vineyard truly comes into its own—far better than on a label. And there’s nothing stopping you from leaving with a few bottles—a liquid memento of a day spent on the hillsides.