 Despite similar names, the Encostas d'Aire DOC is quite distinct from the former Encostas da Nave IPR located in the northern half of the Beiras region, which is now part of Távora-Varosa DOC and no longer used on wine labels, reducing the risk of confusion.The principle grapes of the Encostas d'Aire region include Arinto, Baga, Fernao Pires, Periquita, Tamarez, Tinta Amarela and Vital.There are two subregions which may be indicated on the label together with the name Encostas d'Aire