The appellation is an enclave within the Coteaux du Layon area in the Loire wine region. The name is derived from the "best quarter" (Quart) around Chaume in the municipality of Rochefort-sur-Loire. In ancient times, the feudal lord kept the yields of this quarter. The vineyards cover more than 50 hectares of vineyards on steep slopes facing south on the right bank of the Layon, a tributary of the Loire. This long-lasting sweet wine is made from 100% pure variety of noble rot (not necessarily) or at least overripe grapes of the Chenin Blanc variety (here Pineau de la Loire). The yield is limited to a maximum of 25 hl/ha, the alcohol content must be at least 12% vol, the residual sugar content at least 34 g/l.