L-5 (sima 268) - Portillo de Arriba

An interesting karst area located east of boundary marker 268, above the Arette - de la Piedra de San Martin ski resort (France). It is reached by the trail that crosses the Arlas peak toward the Pescamou pass; then follow the waymarked path that forms the divide between France and Spain in the direction of boundary marker 268, locating the mouth of the pit about 350 metres west of that marker.