What are the three premium dry white wine regions of Bordeaux?

The three premium dry white wine regions of Bordeaux are indeed represented in the answer selected. The Graves region, particularly its sub-region Pessac-Léognan, is renowned for producing high-quality dry white wines primarily from Sauvignon Blanc and Sémillon grapes. These wines are known for their complexity, balance, and aging potential, which places them in the premium category.

Entre-Deux-Mers is notable for its production of dry white wines as well, though it is less prestigious in reputation compared to wines from the Graves area. While it produces acceptable quality wines, it does not hold the same premium status.

Overall, the combined emphasis on Graves and Pessac-Léognan as prime locations for premium dry white wines highlights the excellence and distinct characteristics associated with Bordeaux's dry white wine production.