Geography
Chablis sits in the far north of Burgundy, about 80 miles northwest of the main Côte d'Or, closer to Champagne than to Beaune. The vineyards are perched on Kimmeridgian limestone hillsides along the Serein river, with the famous fossil-shell soils (the same geological formation that runs under southern England) giving the wines their distinctive mineral signature. The climate is significantly cooler than the rest of Burgundy: spring frosts are a real and recurring risk.
Classification
Four-tier hierarchy: Petit Chablis (the basic tier, from cooler/younger soils), Chablis (the village-level appellation, the workhorse), Chablis Premier Cru (40 climats: Mont de Milieu, Montée de Tonnerre, Vaillons, Fourchaume are the most famous), and Chablis Grand Cru (a single hill across the Serein from the town, with seven climats: Les Clos, Vaudésir, Valmur, Grenouilles, Bougros, Preuses, Blanchot).
Style of the wines
Chablis Chardonnay is the most austere and mineral expression of the grape: green apple, lemon, white flower, crushed seashell, wet stone, and a saline-mineral finish that is shorthand for 'Kimmeridgian terroir.' The cool climate gives the wines bright high acid; the limestone soils contribute the saline mineral spine; tradition (and increasingly biodynamic farming) keeps the wines lean and precise. Petit Chablis is the lightest; Grand Cru shows the most weight and aging potential. Oak influence varies: top producers split into stainless-only (Raveneau, Dauvissat) and barrel-aged (William Fèvre, Drouhin) camps.
How they age
Top Chablis Premier Cru ages fifteen to twenty-five years. Grand Cru, particularly Les Clos and Vaudésir, can age thirty years and develop honeyed, nutty, smoky tertiary complexity. Chablis from a great vintage and a serious producer is among the most age-worthy whites in France.
Producers we know
Domaine Raveneau (the legendary reference: small production, cult following), Vincent Dauvissat, Domaine François Raveneau, William Fèvre, Domaine Long-Depaquit, Jean-Paul et Benoît Droin, Christian Moreau, Pattes Loup (Thomas Pico, biodynamic).