Arab emirs called it the Great River; today it is called the Guadalquivir and it flows for 400 miles from the Carzola mountain range in Spain to the Atlantic Ocean. Together with a lone fox, we embark on the ultimate reality road trip along the banks of the Guadalquivir, from the snow-covered summits to the seashore, enjoying the greatest biodiversity in Europe. The fox’s goal is safer ground, and on his way he meets a motley crew of animals including an Iberian lynx, golden eagle, spider crab, dragonflies and sturgeon. This spectacular variety of landscapes and fauna is a must-see.