Ride past the lively Plaza del Ensanche (12,5km) and continue for 300m along the main avenue until you reach a kiosk-bookshop and a playground. Near the kiosk, set foot on the ground and cross the avenue to reach the opposite sidewalk on the right. Quickly turn into a paved street that slopes down to the church of Juncal (13km). Pass to the right of the building to reach a park: stairs to be followed on the left, lead down to the street below the church. From there, follow Santiago Street lined with bars. At the end of the street, turn right over the bridge and immediately continue on the left onto a bike path (Chemin de la Baie). Follow the path along a wetland area (Osinbiribil) on the banks of the Bidassoa River. The walk returns in a straight line, along a canal, to the GI-636 (14,3km): ride along the avenue to the left, on the sidewalk. There is a bike path along the Bidassoa River to take you to the bridge at Béhobie. Take the international bridge to the left to return to the parking lot, on the French side.