Douro is a Portuguese Wine region centered on the Douro River in the Tras-os-Montes eAlto Douro region. It is sometimes referred to as the Alto Douro (upper Douro), as it is located some distance upstream from Porto, sheltered by mountain ranges from coastal influence. The region has Portugal's highest wine classification as a Denominacao de Origine Controllada (DOC) and is registered as a Protected designation of origin under EU and UK law, and as a Geographical Indication in several other countries through bilateral agreements. While the region is best known for Port Wine production, the Douro produces just as much table wine (non-fortified wines) as it does fortified wine. The non-fortified wines are typically referred to as "Douro wines".