 The AOC boundaries of Saint-Nicolas-de-Bourgueil fall within the Bourgueil AOC, northwest of the commune of Bourgueil itself on terraces of silt deposits that border the Maine-et-Loire department and Anjou wine region.Centered on the commune of Saint-Nicolas-de-Bourgueil, the vineyard soils of the AOC are not much different than the greater Bourgueil region with the exception of a slightly higher sand/limestone content (known locally as "varennes").About a third of the region's vineyards are planted on Turonian chalk, a type of limestone.