Porto is the second-largest city in Portugal, after Lisbon, and one of the major urban areas in Southern Europe and the capital of the second major great urban area in Portugal. Located along the Douro river estuary in northern Portugal, Porto is one of the oldest European centres, and registered as a World Heritage Site by UNESCO in 1996. Its settlement dates back many centuries, when it was an outpost of the Roman Empire.
One of Portugal’s internationally famous exports, port wine, is named for Porto, since the metropolitan area, and in particular the adegas of Vila Nova de Gaia, were responsible for the production and export of the fortified wine. The Porto region is also a major producer of cork.