Château-Chalon is an AOC wine region in Jura based around the village of Château-Chalon. Only white wines from the Savagnin grape are premitted for the region's distinctive wine style known as "vin jaune" which shows pronouced and fabulously rich, sherried flavours.
There are other appellations within Jura that are permitted to produce AOC vin jaune, most notably the Côtes du Jura AOC, but Château-Chalon is the finest source of this style.
The grapes are harvested at a high ripeness levels that allow for a potential alcohol content of at least 12% in the final wine (unilke other Jura wine regions which permit a minimum of 11.5% abv). The difference from other late harvest French wines, such as Sauternes, is that these are never botrytized.
Vin Jaune requires 6 years and 3 months to graduate, again non-ouillees (not topped up), before being bottled in the traditional 62cl 'Clavelin'. Once bottled, the wine is of great longevity, and can age for several decades.