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A view of a charismatic old portuguese port wine Rabelo boat, now used as a touristic transport on the Douro river, Oporto, Portugal.
The name may have come from the Celtic tribes that inhabited the area before Roman times: the Celtic root is *dubro- and in modern Welsh dwr is 'water' with cognate dobhar in Irish (in Wikipedia. Traditionally, the wine was taken down river in flat-bottom boats c.