The top two are the Crus of Chablis and include the 7 Grand Cru vineyards followed by the lower Premier Crus (Appellation Chablis 1er Cru Controlée). Below these tiers are the lower designations of basic Chablis AOC and Petit Chablis.
Chablis is brisk and fruity, very dry and with a refreshing acidity. In the nose, there are flavors of green apple and lemon. In the mouth Chablis delivers aromas of vanilla, lemon and linden. When older, Chablis has a golden color and is more spicy.
Appellation Chablis Grand Cru Controlée
Appellation Chablis Premier Cru Controlée
Appellation Chablis Controlée
Appellation Petit Chablis Controlée
data source: terroir-france.com, wikipedia