Excellent views. The Alcántara II reservoir was the one with the highest capacity built in Spain and the second in Europe until 1990, with its 3,162 cubic hectometers and a length of 91 kilometers. Its lightened gravity dam and double buttress, formed by 19 independent triangular profile elements, brings together the confluent waters of the Tajo, the Alagón and the Tiétar (these last two are tributaries of the first).