The word Portugal derives from the combined Roman-Celtic place name Portus Cale; [2] [3] a settlement where present-day's conurbation of Porto and Vila Nova de Gaia (or simply, Gaia) stand, along the banks of river Douro in the north of what is now Portugal.. Porto stems from the Latin word for port or harbour, portus, with the second element Cale ' s meaning and precise origin being less clear. More @Wikipedia
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