Santillana reservoir is a gorgeous place, surrounded by cattle fields and with the Guadarrama mountain range in the background. Here you can find lots of waterfowl, as well as some of the most iconic endemic birds of the Iberian Peninsula, such as Spanish Imperial Eagle, Azure-winged Magpie, Iberian Grey Shrike, and Cinereous Vulture. If you wish, after the birding tour, you can visit Manzanares Castle, the best-preserved medieval fortress in Madrid.