Into the Pyrenees

C 136 (good for most of the way, but hilly and winding) runs north up the valley of the Río Isuela towards the Pyrenees, with the Sierra de Guarra (2076m/6811ft) on the right. Beyond Nueno are a number of short tunnels. The road then skirts the green waters of the Embalse de Arguis and comes to Arguis, with a magnificent view of the plain to the rear.