In the heart of the Douro, vineyards are rated according to their suitability to produce high quality Port. A rated vineyards are all pointed straight south and close to the river for ease of transport to the city of Oporto, maximum light reflection from the river and heat. Letter F vineyards are the other thing. Stony soils at the top of the canyon, facing east or north, and exposed to the wind and rain. These are exactly the vineyards that Joana Macanita is looking for, as she wants wines with acidity, aromatic complexity, and elegance. This wine contains more than 20 red and white varieties co-planted and fermented.