To get to the starting point from Arguedas, head south on the NA-8712 then turn left towards Parque Natural Bardenas Reales. Enter the park and follow the road straight on to the end, to the military zone with a telecommunications pylon and viewing points. Take the track on the left – which is almost straight – go round a wide bend to the left and then to the right, and you’ll reach a large crossroads with the statue of the Segador Bardenero about fifty metres to the right. Park in the large open spaces at the crossroads.
(S/E) Head south-east to a small pond, which you should walk alongside for about a hundred metres (or what remains of it if it is the dry season).
(1) Take the path on the left and continue straight on to the sheepfold. There’s a beautiful view over the deserted plain and the surrounding hills. Retrace your steps for about 300 m.
(2) Take the path on the right which leads along the eastern slope of the “Cabezo de las Cortinas” hill (364 m). Then continue until you reach the top, and walk around the plateau. From this vantage point, you can see the rest of the walk that will take place in the valley. Head back down the same path for about 200 m until you turn sharply left towards the north: you’ll need to make your own way to reach the edge of the field below.
(3) Walk along the right-hand side of the field for about 300 m until you reach the clearly visible gullies. An underground stream (often dry) has carved out channels running along the edge of this field, and through gaps in the vegetation you can make out its course; avoid walking on the ‘natural bridges’ that span it. Take care if you need to cross them.
(4) At this point, find a gentle slope to enter the canyons (weather permitting, of course) and head left to follow the main stream bed to the road.
(5) Cross the road and continue through the canyon towards the distinctive peak of Casteldeterria, visible in the distance.
Follow this route to go round Casteldeterria, and exit the canyon to return to the car park (S/E).

