Boulay is located in the town of Chavignol which is considered one of the best towns within the district of Sancerre for wine production (Sancerre is the name of a village itself, but the wine producing area of "Sancerre" extends to many surrounding villages as well).
The wines of Chavignol often have the most concentration and body of any wine from Sancerre. Boulay's grapes are all organically grown, he uses only yeasts that are naturally occurring in the vineyards, and all of the fruit is hand harvested.