The Guadarrama mountains are a mountain range crisscrossing the Spanish highlands, dividing the historic region of Castile in two and separating the wealthy, but rampantly overbuilt region of Madrid from the rural and undeveloped Castile-and-Leon. This project explores the possibility of addressing the three main current challenges in the area (climate change, energy crisis and urbanistic disparity) through a drastic landscape intervention in the water system.