“The traveller, still seeing the Tagus and with the rivers he crossed in his memory: the Jarama, Henares, Tajuña; amuses himself composing some spiritual verses hooked on his memory”. Journey to the Alcarria, Camilo Jose Cela. The Entrepeñas reservoir did not exist when the book was written. It takes up 3213 hectares and holds up to 835 hm3. Together with the Buendia reservoir, it supplies water to the Tagus – Segura water transfer.