Go under the Arriou Cau bridge crossing the A65 motorway, using the concrete footpath to reach a trail and then a small ford with a few blocks crossing the stream. Walk along the hedge to the gravel track and turn right onto a long farm track overlooking the Luy de Béarn valley, until you reach the housing estate on the outskirts of Caubios-Loos. At the end of the housing estate, turn left onto the RD 216 and continue for 1 km.