Which is NOT one of the famous regions producing red wines in the Haut-Médoc?

Chablis is known primarily for its white wines made from Chardonnay and is located in the Burgundy region of France, significantly distant from the Haut-Médoc, which is part of the Bordeaux wine region. The Haut-Médoc is renowned for its red wine production, particularly from grape varieties like Merlot and Cabernet Sauvignon.

In contrast, St Julien, Margaux, and Pauillac are all recognized appellations within the Haut-Médoc known for their high-quality red wines. Each of these regions contributes to the overall reputation of Haut-Médoc as a leading producer of fine Bordeaux reds. Therefore, Chablis does not fit within the context of this question since it is associated with white wine production and is not located in the Haut-Médoc.