Map of the Douro Demarcated Region where the topography, main wine estates and wharves of the Douro River are pointed out. This map, which traces the course of the river from the Spanish border to the Oporto's mouth was one of the first cartography surveys of the Douro River, where it is possible to observe the wine estates, warehouses, different kinds of crops, planting areas, bridges, crossing points, roads and paths located by the river.