A grandiose river in southern Spain flows thru Andalusia from North to South, like a huge artery that stretches along 600 kilometers. From its birthplace, in the Cazorla mountains, all the way to the mouth of the river, that reaches the shores of Doñana National Park, a fox will become the story's main character. Through its eyes, we will come to discover the spectacular biodiversity that this little creature finds along the way.