Which is a major appellation in southwest France known for producing Bordeaux-like wines?

The major appellation in southwest France known for producing Bordeaux-like wines is Bergerac. This region is situated to the east of Bordeaux and shares similar climatic conditions, grape varieties, and winemaking practices with Bordeaux, which allows it to produce wines that can closely resemble those from the Bordeaux region. Bergerac has a wide range of red, white, and rosé wines and utilizes key grape varieties such as Merlot and Cabernet Sauvignon, similar to those found in Bordeaux blends.

Saint-Emilion, Pomerol, and Graves are indeed all significant areas within the Bordeaux region. Although they produce excellent Bordeaux-style wines, they are not categorized as appellations in southwest France outside the Bordeaux classification. Saint-Emilion and Pomerol are esteemed for their Right Bank Merlot-dominated wines, while Graves is known for its unique terroir that can produce both red and dry white wines. However, these appellations are part of Bordeaux, contrasting with Bergerac, which, while indicative of Bordeaux's style, is geographically distinct.