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The Serra do Marão is the sixth largest increase in mainland Portugal, with an altitude of 1415 m and 689 m of topographic prominence. It lies in the transition region of the Douro Litoral Behind the Montes and Alto Douro. At the highest point is the vertex of the Geodetic and Astronomical Observatory Marão Marão. The inertia of the climate gives the interior a more continental Montes. Presents a good vegetable patch, even though they are frequent summer fires, mainly consisting of pine trees. The vineyard is the dominant culture in inhabited areas of its southern slopes. Geologically comprises large patches or schist or granite, existing in the area of the town of Limestone Campanhó a small pouch, which is exploited for agricultural purposes (for correction of soil acidity). Along the mountain are several installations of abandoned mining of wolfram which had its peak in the time of World War II. Great natural barrier, significantly delayed the progress of the Interior Trasmontano until the nineteenth century. Bypassed him by the South Line of Douro it seemed the quickest way to overcome the Marão since the 1880s, which converged to other railways parallel to Marão, ensuring a flow of passengers and goods continued.
note: picture is not mine