The name “Douro” has several origins: one comes from the Celtic ‘dur’, which means water. Another says that in the deep slopes existed, in ancient times, gold nuggets, hence the name ‘de + ouro’. Yet, another version states it derives from the Latin ‘Durius’, which means hard, due to the hardness of its sinuous outlines, protruding rocks, violent flows, and rapid waters that made this river untamed.