Ordesa Valley itself is a spectacular glacial valley with a clear form of "U", located southwest of the Massif of Monte Perdido, whose bottom the river Arazas descends in a succession of beautiful waterfalls. Since initiating the valley, Circus of Soaso, known as the "Cola de Caballo" and that opens in a white fan that slides down, going through the steps of Soaso, a succession of multi-tiered waterfalls, to the waterfalls Strait and the Cave, huge waterfalls winding slides have carved in limestone