You can pootle about for half a day or more here, sauntering along the banks of the clearest mountain river and observing the flora and fauna surrounding you.

You start in the village of Sanavastre (near the Das aerodrome) and then follow the signs to the Segre. You can park where you see the bridge. It is perfectly safe, just wobbly!!

You will see lots… And there are notices scattered around giving you more information on what you are seeing except I think they are in Catalan!