The region of Trás-os-Montes (Figure No. 7) is situated in the north-east of Portugal mainland and has a history in wine production dating back to the Roman occupation. It is divided into three sub-regions: Chaves, Valpaços and Planalto Mirandês. Despite the very specific characteristics in Trás-os-Montes region there are many micro climates, which allied to the differences in the constitution of the soil, usually granitic with schist patches, and to a greater adaptability of certain grape varieties, allow achieving very different wines. Such differences allow the definition of three sub-regions for the production of quality wines with the Trás-os-Montes DO. The criteria used were essentially the altitude, sun exposure, climate and structure of the soil; the Designation of Origin (DO Trás-os-Montes) was recognized on November 9th, 2006 (Decree No. 1204 / 2006).
The most important red grapes of this region are Trincadeira, Bastardo, Marufo, Tinta Roriz, Touriga Nacional and Touriga Franca, and the most planted white grape varieties are Syrah, Fernão Pires, Gouveio, Malvasia Fina, Rabigato and Viosinho.