Saint-Estèphe is one of the major appellations within the Bordeaux wine region of France, situated on the Left Bank of the Gironde Estuary. It is renowned for producing robust and age-worthy red wines, primarily from Cabernet Sauvignon grapes, although Merlot, Cabernet Franc, and Petit Verdot are also grown in smaller proportions.

The terroir of Saint-Estèphe is characterized by gravelly soils mixed with clay and limestone, which provide excellent drainage and contribute to the distinctive mineral character of the wines. The maritime climate moderated by the nearby Atlantic Ocean also plays a significant role in shaping the region's wines, with mild winters and relatively cool summers allowing for a slow and even ripening of the grapes.

Saint-Estèphe wines are known for their power, structure, and firm tannins, making them ideal for aging. They often exhibit flavors of dark fruits, such as blackcurrant and plum, along with notes of tobacco, cedar, and earthy nuances. The wines can be quite intense in their youth but develop greater complexity and finesse with bottle age.

Some of the most famous estates in Saint-Estèphe include Château Cos d'Estournel, Château Montrose, Château Calon-Ségur, and Château Phélan Ségur, among others. These estates produce wines that exemplify the unique characteristics of the appellation and contribute to its reputation for producing some of the finest Bordeaux wines.