What coastal city, located at the mouth of the Douro River in Portugal, is world-famous for its wine?

Porto

Porto, from which the name "Portugal" is derived, is renowned for its Port wine, a fortified wine enjoyed around the world. The production and exportation of this wine have played a crucial role in the local economy since the 17th century, promoting the development of extensive wine cellars along the quays of the Douro. The architectural and cultural richness of Porto, combined with its historical importance in the wine trade, earns it international recognition.