For those who want to experience the adventure, walking to the headwaters of Acheron, passing this river which is inside the mountain with the transparent cold water that reaches to the knee or to the waist, between towering vertical rocks… It is a route that creates to the visitor the feeling of isolation. It does not present risks but it is necessary suitable equipment and fitness, as there is no intermediate exit from the gorge. It is required walking about two miles in the water and swimming against the river’s stream of 10 to 15 meters. It is necessary appropriate clothing, such as swimsuit and fitting shoes. This route has been calculated about one hour and 30 minutes.