The Nature Reserve, made up of two Natural Parks (Arribes del Duero and Douro Internacional), is the largest in terms of dimension and biodiversity in the european continent, which makes it very attractive to be visited regardless the season of the year. This is the land of ‘vettons’ and ‘zoelas’, celtic tribes that established the Culture of the Granite Stone in the landscape over 2,500 years ago, under the majestic flight of the Black Stork and the Egyptian Vulture