Casteller DOC is produced in 48 municipalities located in some of the main valleys of the Province of Trento: Valle dell'Adige, Valle di Cembra, Vallagarina, Valle del Sarca and Valsugana. It consists of a blend based mainly on Merlot grapes mixed with other important local vines. Probably due to short-sighted choices, the denomination has almost disappeared: both producers and consumers have therefore focused on other products.