At the time, the inhabitants of Bourg were fishermen, sailors or winemakers and the latter benefited from the perfect combination of a commercially minded town and a soil made for the vine.
[2] Bourg is located 20 km (12 mi) north-west of Bordeaux, at the confluence of the rivers Dordogne and Garrone with an average altitude of 20 m above sea level.
Although the Côtes de Bourg is composed of mainly clay and limestone soils, their make-up is so rich that there is a veritable mosaic of sand and gravel in the area around Pugnac.
The Atlantic Ocean plays an important role in the temperate climate of le Bourgeais and this accentuates the expression of terroir, aided by the regulation of temperatures by the effects of the Gironde estuary.
According to scientists, especially Jean Duteau, the Côtes de Bourg benefits from 10% additional sunlight, 1° to 2° less extreme temperatures and a 10% to 25% lower rainfall depending on the year, in comparison with Bordeaux.