The mixture tubes descent the senderismo with basic techniques of escalation for the descent of rivers, this permits us to agree to beautiful spots that of another way they would be inaccessible.  This activity is used to carrying out near the births of the rivers, being this the part more encañonada.  There it will be that to carry out shave them, leaps to pozas, to swim, etc., since does not permit another type of navigation.

From Alquézar will be able you enjoy the following ravines for its descent:

Tube of the Vero Ravine Basender Fornocal Sector of the Vero Sector of the Mascún Tube of the Balcés Ravine of Fund