Two routes are possible.
 

Entrenched in the Segre gorges, at Llo, the path runs along a steep cliffside for 800m climbing up to 259m.  Two routes are possible, one of which is easier than the other.

2 possibilities:  Llisses de Llo AD and Llisses dretes D+.

The largest via ferrata (a mountain route fixed with cables, ladders and bridges) in the French Pyrenees, it has all the latest equipment and is just as good as its alpine cousins.  Situated near the village of Llo, the Segre gorges and the hot sulphur water baths, the path runs along a steep cliffside for 800m climbing up to 259m.  Two routes are possible, one of which is easier than the other (classified AD) which allows climbers with less experience an easier climb.
Already, from the departure point, a footbridge situated above the forest path of the Segre gorges gives you a chance to admire the marvellous countryside.  You then climb up the rock face, via a succession of ledges and vertical climbs, up to the historical site of San-Feliu, where you will find a Romanesque chapel currently being restored.  The return route is signposted along the pathways and crosses the picturesque village of Llo.
The different parts of the route have been given Catalan names, Llisees de Llo (the easier AD route), or Llisses dretes (the more difficult D+ route), then El pas de las Orenetes (the path of the swallows), El pas de la Guille (the path of the fox), El Roc de l'Isard (the rock of the Isard – a pyrenean mountain goat), El Replojado dels Bous (the shelter of the cattle) and finally, La Pujada de San Feliu (the San Feliu climb) where you can appreciate the fantastic panoramic view over Cerdagne.